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The Hebrew: kohen, Greek: hierus, Latin: sacerdos, always denote one who offers sacrifices.
At first every man was his own priest, and presented his own sacrifices before God. Afterwards that office devolved on the head of the family, as in the cases of Noah (Genesis 8:20), Abraham (12:7; 13:4), Isaac (26:25), Jacob (31:54), and Job (Job 1:5).
The name first occurs as applied to Melchizedek (Genesis 14:18). Under the Levitical arrangements the office of the priesthood was limited to the tribe of Levi, and to only one family of that tribe, the family of Aaron. Certain laws respecting the qualifications of priests are given in Leviticus 21:16-23. There are ordinances also regarding the priests' dress (Exodus 28:40-43) and the manner of their consecration to the office (29:1-37).
Their duties were manifold (Exodus 27:20-21; 29:38-44; Leviticus 6:12; 10:11; 24:8; Numbers 10:1-10; Deuteronomy 17:8-13; 33:10; Mal. 2:7). They represented the people before God, and offered the various sacrifices prescribed in the law.
The whole priestly system of the Jews was typical. It was a shadow of which the body is Christ. The priests all prefigured the great Priest who offered “one sacrifice for sins” “once for all” (Hebrews 10:10, 12). There is now no human priesthood. (See Epistle to the Hebrews throughout.) The term “priest” is indeed applied to believers (1 Peter 2:9; Rev. 1:6), but in these cases it implies no sacerdotal functions. All true believers are now “kings and priests unto God.” As priests they have free access into the holiest of all, and offer up the sacrifices of praise and thanksgiving, and the sacrifices of grateful service from day to day.