The spectrum of meaning of “faith” and “faithfulness” may be applied both to God and to human beings. Cognates of “faith” are used interpersonally in human relationships but are used in the Bible specifically to denote the interaction between God and humanity, and human response to God. A question of theological pertinence is the degree to which one must distinguish between faith as an agent of personal belief and faith as an object of personal belief as pertaining to the relationship between God and human being.

In Hebrew the words most often translated “faith” or “faithful” are ’emunah and ’emet. In Greek the word rendered most frequently “faith” or “faithful” is pistis. In terms of their semantic domains, ’emunah and ’emet connote an objective sense of reliability (of persons) and stability (of inanimate objects); pistis conveys more of a subjective sense of placing confidence in a person, trusting in a person, or believing in a person or set of propositions. This subjective sense of pistis is correlated to considering the person or object of trust, belief, or confidence as reliable—“faithful.” Pistis likewise is used to communicate the quality of this person or belief as “committed” and “trustworthy.”

As noted, to some degree the meanings of the Hebrew and Greek terms overlap. However, certain dissimilarities are apparent as well. These observations play out in OT and NT expressions of faith. Martin Buber (1878–1965), a Jewish philosopher known for his academic work in the area of “faith,” distinguished between two types of faith: OT/Judaic faith, typified as tribal, national, and communal trust and fidelity based on the covenant; and NT/Christian faith, characterized as individual persuasion or belief in something.

Old Testament

Faith in the context of the OT rests on a foundation that the person or object of trust, belief, or confidence is reliable. Trust in Yahweh is expressed through loyalty and obedience. The theme of responsive obedience is emphasized in the Torah (Exod. 19:5). In the later history of Israel, faithfulness to the law became the predominant expression of faith (Dan. 1:8; 6:10). OT faith, then, is a moral response rather than abstract intellect or emotion.

Faithfulness as an attribute of God. Yahweh is presented in the OT as faithful to his promises, as faithfulness is a part of his very being. In the Torah the Israelites are reminded, “The Lord your God is God; he is the faithful God, keeping his covenant of love to a thousand generations of those who love him and keep his commandments” (Deut. 7:9). Not only is God presented as keeping his covenant, but also the prophet Hosea calls God “the faithful Holy One” (Hos. 11:12). Isaiah likewise pre-sents faithfulness as an attribute of God (Isa. 49:7). The people can rest assured, for God is unchanging and reliable.

The psalmist speaks of Yahweh as the faithful God: “You have redeemed me, O Lord, faithful God” (Ps. 31:5 NRSV); “he remains faithful forever” (Ps. 146:6). The translation “faithful” is warranted in these instances in the psalms. Its connotations are “truth” and “trustworthiness.” Yahweh is ascribed divine honor by his people recognizing and acknowledging his faithfulness and trustworthiness, and by responding to it in obedience as the people of God.

The faith of Abraham. Abraham’s (Abram’s) faith is used in the Bible as an example (Rom. 4:12; Gal. 3:6–9) in the sense that Abraham trusted God’s faithfulness in a way unequaled by other characters in the OT. Abraham lived in Mesopotamia when God spoke to him in a vision and told him that his descendants would be as innumerable as the stars in the sky (Gen. 15:1–5). Abraham trusted that God would be faithful to keep his promise despite insurmountable obstacles. This trust was credited to Abraham as righteousness (15:6). God subsequently initiated a covenant with Abraham (15:7–21).

Abraham’s life was characterized by his obedience to God and by his considering God to be faithful, something well noted by the early church (Heb. 11:8–11, 17–19) and used as an example of faith in the Christian walk (12:1). The three best-known examples of Abraham’s obedience and hence trust in God’s faithfulness are found consecutively in the departure from his homeland, the birth of his son Isaac, and the offering of Isaac as a sacrifice.

When God said to Abraham, “Go from your country, your people and your father’s household to the land I will show you” (Gen. 12:1), Abraham went as commanded (12:4). He obeyed despite his cultural disposition toward staying in the area of his ancestry and kin, and he went without knowledge of an appointed destination. Elderly and childless (12:7, 11–12), Abraham considered offspring to be impossible. However, Abraham trusted that God would be able to raise offspring for him, believing that he would become a great nation (12:2). His offspring Isaac was later reminded of the obedience of Abraham (26:5). Abraham’s greatest challenge of trust in God’s faithful provision came when he was commanded to offer his son Isaac as a burnt offering (22:2). He was commended for fearing God without reservation (22:12).

When the priest and initial leader of the Maccabean revolt, Mattathias, gave his farewell speech to his sons as he faced death in 166 BC, he placed his deeds along the lines of biblical heroes of faith such as Abraham. With likely reference to Abraham offering Isaac, he said, “Was not Abraham found faithful when tested, and it was reckoned to him as righteousness?” (1 Macc. 2:52 NRSV). The early church likewise used this test in Abraham’s life as an example of his faithfulness, while at the same time claiming that the source for this faithfulness was found in faith—faith in God’s faithful provision (Heb. 11:17).

Faithfulness to the covenant. Faithfulness embodies the very core of the covenant relationship. God seeks a love relationship with humanity expressed in initiating his covenant. He is described as “abounding in love and faithfulness” (Exod. 34:6). His covenant love (Heb. khesed) is closely correlated to his faithfulness: “He is the faithful God, keeping his covenant of love” (Deut. 7:9). Throughout the OT, Yahweh is shown as loyal to his covenant. Yahweh’s righteousness is seen in his faithfulness in keeping the covenant even when his people were disloyal and did not acknowledge his faithfulness. He delivered his people out of Egypt because of his covenant love and righteousness, as the psalmist declared: “But from everlasting to everlasting the Lord’s love is with those who fear him, and his righteousness with their children’s children—with those who keep his covenant and remember to obey his precepts” (Ps. 103:17–18). He delivered them out of their subsequent exile, declaring them righteous because their repentant hearts trusted in his faithfulness and sought to obey his covenant. Yahweh said, “If I have not made my covenant with day and night and established the laws of heaven and earth, then I will reject the descendants of Jacob and David my servant and will not choose one of his sons to rule over the descendants of Abraham, Isaac and Jacob. For I will restore their fortunes and have compassion on them” (Jer. 33:25–26).

God’s people, however, were expected to reciprocate and trust his faithfulness (1 Chron. 16:15–16). When God met with Moses on Mount Sinai, he instructed Moses to tell the Israelites to obey the commands fully and to keep the covenant. It was only then that they would be a treasured possession, a holy nation (Exod. 19:5–6). The Israelites were expected to follow in obedience and thus reciprocate God’s faithfulness. The people of Israel often failed, but David and other godly people chose to be faithful to God and walk in his truth (Ps. 119:30; Heb. 11:4–38).

Faith counted as righteousness. Whereas faith is used throughout the OT in reference to God’s faithfulness and loyalty, it is used in Hab. 2:4 as pertaining to the faith of the righteous: “But the righteous will live by his faith” (NASB). In Rom. 1:17 Paul specifies, “For in the gospel a righteousness from God is revealed, a righteousness that is by faith from first to last, just as it is written: ‘The righteous will live by faith.’ ” He notes that God’s righteousness, even as revealed within OT promises, is by faith (“faith to faith,” or “faith, through and through”). By the parameters “from faith to faith,” Paul intends to exclude works of righteousness, a theme that he carries consistently in the first four chapters of Romans. Justification, for Habakkuk’s hearers, meant faithfulness, a single-minded focus on Yahweh to meet life’s essential needs. For Paul, salvation by way of justification meant that reliance upon Christ alone was foundational. In Pauline theology, faith is a thread connecting the old covenant with the new covenant.

New Testament

Faith is a central theological concept in the NT. In relational terms, faith is foremost personalized as the locus of trust and belief in the person of Jesus Christ.

In the Gospels, Jesus is spoken of not as the subject of faith (as believing in God), but as the object of faith. In the Synoptic Gospels, faith is seen most often in connection with the ministry of Jesus. Miracles, in particular healings, are presented as taking place in response to the faith of the one in need of healing or the requester. In the Gospel of John, faith (belief) is presented as something that God requires of his people (6:28–29).

In the book of Acts, “faith/belief” is used to refer to Jews and Gentiles converting to following the life and teachings of Jesus Christ and becoming part of the Christian community. The book correlates faith in Christ closely with repentance (Acts 11:21; 19:18; 20:21; 26:18).

Paul relates faith to righteousness and justification (Rom. 3:22; 5:11; Gal. 3:6). In Ephesians faith is shown as instrumental in salvation: “For it is by grace you have been saved, through faith—and this not from yourselves, it is the gift of God” (Eph. 2:8).

In Hebrews, faith is described as “being sure of what we hope for and certain of what we do not see” (11:1). Faith thus is viewed as something that can be accomplished in the life of the believer—a calling of God not yet tangible or seen. To possess faith is to be loyal to God and to the gospel of Jesus Christ despite all obstacles. In the letter of James, genuine works naturally accompany genuine faith. Works, however, are expressed in doing the will of God. The will of God means, for example, caring for the poor (James 2:15–16).

In 1 Peter, Christ is depicted as the broker of faith in God (1 Pet. 1:21), whereas in 2 Peter and Jude faith is presented as received from God (2 Pet. 1:1). In the letters of John “to believe” is used as a litmus test for those who possess eternal life: “You who believe in the name of the Son of God, . . . you have eternal life” (1 John 5:13).

Faith is rarely addressed in the book of Revelation. Rather, faithfulness is the objective. Christ is described as the faithful and true witness (Rev. 1:5; 3:14), the perfect example for believers. One of the believers in Asia Minor, Antipas, is identified as Christ’s witness and faithful one (2:13). Those believers who, like Antipas, are faithful unto death, are called “overcomers” (2:10, 26). The faithless are thrown into the lake of fire, which represents the second death (21:8).

Faith and salvation. The role of faith in salvation is often hotly debated. Views are polarized between Christ as the object of faith and as the subject of faith. These views are designated as an objective genitive (faith in Christ), also known as an anthropological view, and a subjective genitive (the faithfulness of Christ), also known as a christological view. Thus, for example, Rom. 3:22 can be translated as “This righteousness from God comes through faith in Jesus Christ to all who believe” (cf. NRSV) or as “This righteousness from God comes through the faithfulness of Jesus Christ for all who believe” (cf. NET). In the latter translation the faithfulness of Christ is seen as the agent of salvation.

In Eph. 2:8 the phrase “For it is by grace you have been saved, through faith,” points to faith as instrumental in salvation. However, the source of that faith is not made clear. Does God provide the faith required to be saved, and thus the event is out of the hands of humanity? Or does salvation require a response from human beings in the form of faith—that is, trust?

In the Letter to the Romans, Paul indicates a correlation between grace and faith (Rom. 4:16; 5:1–2), and he shows that Abraham’s faith, his belief and unwavering hope in God’s faithfulness, was credited to him as righteousness (4:18–22). In the new covenant this righteousness likewise is credited to those who believe in God (4:23–24).

Faith and works. In Eph. 2:8–10 works are described as an outflow of the faith of believers: “For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God—not by works, so that no one can boast. For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.”

Faith and works are also related in the letter of James, where works appear to be a prerequisite of faith, for faith without works is dead (2:26). While at first sight this might appear to contradict a Pauline understanding of faith and works (Rom. 3:19–5:1; Gal. 2:15–3:24), James and Paul use the word “works” differently. Paul uses it in terms of “obedience to the law,” something obsolete as a requirement in the new covenant. James, however, writes with regard to works of charity, not works of obedience to Jewish ritualistic law. Authentic faith, then, shows the evidence of good works—charity, the fruit of the Spirit.

Faith and the Church

Whereas baptism was a public initiation rite into the first-century Christian community, it was faith in Christ Jesus that was understood as establishing one’s membership in the family of God (Gal. 3:26). This membership was available to both Jews and Gentiles. Faith, the shared belief system in and confession of Jesus’ salvific work, became the common denominator in the Christian community. In Ephesians, faith is identified as one of the unifying elements of the church (Eph. 4:5). The prayer of faith heals the sick person in the church, another unifying element of applying faith (James 5:13–15).

Faith as a spiritual gift. According to the apostle Paul, the gift of faith is closely related to the life and functioning of the church (1 Cor. 12:9). Mentioned among other gifts, or charismata (12:4), this aspect of faith is that benefit of salvation with which certain members of the church are graced and is used for the common good (12:7). This faith, then, is understood as edifying the Christian community at large rather than just the individual believer.

Faith and the Christian life. Christians are described as living by faith (2 Cor. 5:7). Not only does faith lead people to Christ, but also Christ subsequently dwells in believers’ hearts through faith (Eph. 3:17). This Christian faith is subject to testing (James 1:2).

Faith is presented by Paul as present at different levels of growth among believers. Some Christians are weak in faith (Rom. 14:1), whereas others are strong in faith (15:1). Faith can differ in its strength of conviction (4:20–22; 14:5). It is presented as something that can grow (2 Cor. 10:15).

Faith is grouped among gifts and virtues. Lifted out together with hope and love, faith is mentioned among gifts that edify believers in the church (1 Cor. 13:13). Likewise, faith is mentioned as a Christian virtue among the fruit of the Spirit (Gal. 5:22–23).