The offering up of sacrifices is to be regarded as a divine institution. It did not originate with man. God himself appointed it as the mode in which acceptable worship was to be offered to him by guilty man. The language and the idea of sacrifice pervade the whole Bible.
Sacrifices were offered in the ante-diluvian age. The Lord clothed Adam and Eve with the skins of animals, which in all probability had been offered in sacrifice (Gen. 3:21). Abel offered a sacrifice "of the firstlings of his flock" (4:4; Heb. 11:4). A distinction also was made between clean and unclean animals, which there is every reason to believe had reference to the offering up of sacrifices (Gen. 7:2, 8), because animals were not given to man as food till after the Flood.
The same practice is continued down through the patriarchal age (Gen. 8:20; 12:7; 13:4, 18; 15:9-11; 22:1-18, etc.). In the Mosaic period of Old Testament history definite laws were prescribed by God regarding the different kinds of sacrifices that were to be offered and the manner in which the offering was to be made. The offering of stated sacrifices became indeed a prominent and distinctive feature of the whole period (Ex. 12:3-27; Lev. 23:5-8; Num. 9:2-14). (See ALTAR.)