A technical term for “promise” does not appear in the OT, but its concept is present throughout Scripture. God unfolds the history of redemption by employing the idea of promises. The writers of the NT repeatedly assert that Jesus Christ has fulfilled God’s promises in the OT (e.g., Luke 24:44–48; 1 Cor. 15:3–8).

Old Testament

The promises in the OT are closely related to the history of salvation. At each stage of redemptive history, God delivered a new message about redemption, usually in the form of a covenant. Immediately after the fall of humankind, God first revealed his plan of salvation: the promise that the seed of the woman would ultimately crush the head of the serpent (Gen. 3:15). After the flood, God made a covenant with Noah, promising never again to destroy the earth with a flood (Gen. 8:21–9:17).

Most remarkable is the promise that God made to Abraham, Isaac, and Jacob (Gen. 12:1–3; 13:14–17; 17:4–8; 22:17–18; 26:1–5; 28:13–15). God called Abraham in order to give him three specific blessings: the land, descendants, and the channel of blessing among the nations. As a sign of his promise, God made a covenant of circumcision with Abraham and his descendants (17:10–14). With Isaac (26:1–5) and Jacob (28:13–15), God repeatedly reconfirmed the promise made to Abraham. At the time of the exodus and later the settlement in Canaan, God’s promise to Abraham was partially fulfilled by multiplying his descendants into millions and by giving them the promised land.

At Mount Sinai, God made another covenant with the Israelites. In this covenant, God promised that they would be his “treasured possession” among the nations if they would obey him and keep his covenant (Exod. 19:5). God’s special blessings were pronounced for them to be “a kingdom of priests and a holy nation” (19:6). For this purpose, God gave them the Ten Commandments, which became the religious and ethical standard for his covenant people (20:1–17). In the book of Deuteronomy, moreover, God’s promises were made in the form of blessings to the obedient and of curses to the disobedient (Deut. 28). Later these became the criteria by which the kings of Israel were judged to determine whether they had lived an obedient life.

According to 2 Sam. 7:11–16, God made an eternal covenant with David, promising the permanence of David’s house, kingdom, and throne. In this covenant it was also promised that his offspring would build the house of the Lord. The Davidic covenant was partially fulfilled at the time of Solomon, who as king built the house of the Lord, the first temple in Jerusalem (1 Kings 8:15–25). Later, in the period of the classical prophets, when the hope for the Davidic throne was endangered, the permanence of the Davidic throne and kingdom reappeared in the form of messianic prophecy (Jer. 23:5–8; Ezek. 37:24–28). This promise was ultimately fulfilled by the coming of Jesus Christ from the line of David (Matt. 1:1–17).

The history of Israel shows that although the nation repeatedly broke God’s covenants, he remained faithful to them. According to Num. 23:19, God’s promises are absolutely trustworthy: “God is not human, that he should lie, not a human being, that he should change his mind. Does he speak and then not act? Does he promise and not fulfill?” The trustworthiness of God’s promises results from his unchanging character (Ps. 110:4; Mal. 3:6–7). The almighty God has the power to fulfill his promises (Isa. 55:11). When Joshua finished conquering the land of Canaan, he confessed that God was faithful in keeping all his promises to his ancestors (Josh. 21:45; 23:14–15). Joshua himself witnessed that trusting God’s promises is a life-and-death issue. Those who had not trusted his promise to give them the land of Canaan perished in the wilderness, but those who had trusted his promise were allowed to enter it (Num. 14:1–35).

New Testament

The central message of the NT is that God’s promises in the OT are fulfilled with the coming of Jesus Christ. Matthew’s numerous citation formulas are evidence of this theme. In Luke 4:16–21 Jesus pronounces the fulfillment of Isaiah’s promise (about the Messiah’s ministry [Isa. 61:1–3]) in his own life. The book of Acts specifically states that Jesus’ suffering and resurrection and the coming of the Holy Spirit are the fulfillment of the OT promises (2:29–31; 13:32–34). Jesus’ identity both as the descendant of David (Acts 13:23) and as the prophet like Moses (Acts 3:21–26; cf. Deut. 18:15–18) is also regarded as the fulfillment of the OT.

Paul’s view of God’s promises is summarized in this statement: “For no matter how many promises God has made, they are ‘Yes’ in Christ” (2 Cor. 1:20). According to Rom. 1:2–3, Paul regards the gospel as the message that God “promised beforehand through his prophets in the Holy Scriptures regarding his Son.” In Rom. 4 Abraham’s faith is described in terms of his trust in God’s promises, which leads to his righteousness. He is presented as our model of faith in God’s promises. The famous phrase “according to the Scriptures” in 1 Cor. 15:3–4 is, in a sense, understood by Paul as the fulfillment of God’s promises regarding Christ’s death and resurrection.

In the book of Hebrews, the concept of promise plays an important role. In Heb. 6 Abraham is presented as the exemplary man who trusted in God’s promise. The author exhorts the Hebrew Christians to follow Abraham’s model of trust in God’s promise (6:12–20). The author also asserts that Jesus’ new covenant is superior to the old one because his ministry “is established on better promises” (8:6). In Heb. 11 the faith of the great OT saints is acclaimed in terms of their faith in God’s promises.

In the NT, God makes new promises based on the work of Christ, including the final resurrection and the second coming of Christ (John 5:29; 11:25–26; 1 Cor. 15:48–57; 2 Cor. 4:14; 1 Thess. 4:13–18). Furthermore, the message of the gospel is presented as multiple promises, including eternal life, the fullness of life in Christ, the forgiveness of sins, the indwelling of the Holy Spirit, the peace of God, the knowledge of God, and the joy of God (Matt. 28:18–20; John 3:16; 10:10; 14:16, 27; 16:20–24; 17:25–26; Phil. 4:4–9; 1 John 1:9).

Human Promises

The Scriptures contain many cases of people making promises to other people. For example, Abraham made promises to the king of Sodom and to Abimelek (Gen. 14:22–24; 21:22–24). The Israelite spies made a promise to Rahab (Josh. 2:12–21). People also make promises to God: Jacob, Jephthah, Hannah, and the returning exiles (Gen. 28:20–21; Judg. 11:29–40; 1 Sam. 1:11–20; Neh. 10:28–29). Human promises usually are accompanied by the taking of an oath (Gen. 14:22; 21:24; Deut. 6:13; Josh. 2:12–14) or the declaration of a curse in case of its breach (Ruth 1:17; 1 Sam. 14:24; 2 Sam. 3:35; 1 Kings 2:23). It is imperative to keep the promise that one makes to a human being or to God (Num. 30:1–2; Ps. 50:14). In Mal. 2:14–16, divorce is regarded as a breaking of the oath between husband and wife. In OT times, people were afraid of curses falling upon them when they broke a promise. The Bible warns of the danger of making false promises, as doing so will bring about sin and judgment (Lev. 19:12; Deut. 23:21; Zech. 8:17). It is an axiom of the wisdom literature that one should not make promises rashly or lightly (Prov. 20:25; Eccles. 5:1–7), and Jesus prohibits the taking of any oath because of the possibility of its breach (Matt. 5:33–37).