Exodus 29:15-18

29:15 “You are to take one ram, and Aaron and his sons are to lay their hands on the ram’s head, 29:16 and you are to kill the ram and take its blood and splash it all around on the altar. 29:17 Then you are to cut the ram into pieces and wash the entrails and its legs and put them on its pieces and on its head 29:18 and burn ¹  the whole ram on the altar. It is a burnt offering ²  to the Lord, a soothing aroma; it is an offering made by fire ³  to the Lord. ⁴ 

[29:18]  ¹ tn Heb “turn to sweet smoke.”

[29:18]  ² sn According to Lev 1 the burnt offering (often called whole burnt offering, except that the skins were usually given to the priests for income) was an atoning sacrifice. By consuming the entire animal, God was indicating that he had completely accepted the worshiper, and as it was a sweet smelling fire sacrifice, he was indicating that he was pleased to accept it. By offering the entire animal, the worshiper was indicating on his part a complete surrender to God.

[29:18]  ³ tn The word אִשֶּׁה (’isheh) has traditionally been translated “an offering made with fire” or the like, because it appears so obviously connected with fire. But further evidence from Ugaritic suggests that it might only mean “a gift” (see Milgrom, Leviticus 1-16, 161).

[29:18]  ⁴ sn These sections show that the priest had to be purified or cleansed from defilement of sin and also be atoned for and accepted by the Lord through the blood of the sacrifice. The principles from these two sacrifices should be basic to anyone seeking to serve God.