A priest is a minister of sacred things who represents God to the people and the people to God. The OT identifies priests of Yahweh and priests of other gods and idols. The only pagan priest that the NT mentions is the priest of Zeus from Lystra who wanted to offer sacrifices to Paul and Barnabas, whom the crowd mistook for deities (Acts 14:13). All other NT references build upon OT teaching about priests of Yahweh.

Early biblical history records clan heads offering sacrifices for their families (Gen. 12:7 8; 13:18; 22; 31:54; 46:1). Although the patriarchs performed these duties, they are never called “priests”; the only priests mentioned from this time are foreigners such as Melchizedek, the Egyptian priest of On, and Moses’ father-in-law Jethro (Gen. 14:18; 41:45, 50; 46:20; Exod. 3:1; 18:1). Whereas all Israelites could be called “a kingdom of priests and a holy nation” (Exod. 19:6), a distinctive priesthood came to light when God instructed Moses to prepare special priestly clothes for Aaron and his sons (Exod. 28). The high priest was distinguished from the others by more magnificent clothes. By failing to wear their special clothes while serving at the tabernacle, the priests would incur guilt and die (Exod. 28:43).

In NT times many priests exerted religious and civil power as leaders of the Sadducees and the Essenes. Some priests, such as Zechariah, were portrayed as righteous men (Luke 1:5–6). Others were said to have come to faith in Jesus (Acts 6:7). Supporting the role assigned by Moses, Jesus regularly required those whom he healed to show themselves to the priest. Even so, most Gospel references to priests underscore their opposition to Jesus’ ministry and the role they played in his trial and crucifixion. This opposition continued after the resurrection, as priests challenged the witness of the apostles. When Peter and John proclaimed that a crippled beggar had been healed by Jesus’ power, the priests and others jailed, interrogated, and forbade them from speaking in Jesus’ name (Acts 4:1–20). The Sanhedrin questioned Stephen about charges of blasphemy and speaking against the temple and the Mosaic law (6:11–7:1). Saul (Paul) received a letter of authority from the high priest to arrest Christians (9:1–2). Later, as a follower of Jesus, he stood trial before Ananias, who charged him before Felix (24:1), and a wider group of chief priests who charged him before Festus (25:1–3).

Hebrews uniquely highlights how the priesthood of Jesus surpassed the OT priesthood. The OT priests presented sin offerings, but their sacrifices needed to be repeated regularly, whereas Jesus, the faithful and merciful high priest, offered a sacrifice that never needed repeating and was available to everyone at all times. Jesus also surpassed the Aaronic priests because they first needed to offer sacrifices for their own sins, but he never sinned. Furthermore, since he offered the perfect sacrifice of himself, all people, not just priests, could draw near to God.

The NT develops the idea of a priesthood of all believers by taking the concept that Israel would be a kingdom of priests and transferring it to the church (1 Pet. 2:4–9; cf. Exod. 19:6). Reflecting the general biblical view of priesthood, believers offer spiritual sacrifices to God, represent God to the world by revealing his works of salvation, and represent the world to God through prayer. In the NT, the priesthood of believers is corporate; a priestly office in the church is never expressly mentioned.