Leviticus 1:6

The priest would burn the whole animal, except for the skin, which he kept as his share of the offering (Leviticus 7:8).

burnt offering (Hebrew ‘olah, which means “what goes up”): The Hebrew word suggests the animal rises up in flame and smoke. Its hide was not burned, but given to the officiating priest as payment (Leviticus 7:8). They completely burned this offering on the altar (1:9).

Its purpose was to turn away God’s judgment against sin. It also makes the worshiper clean in a ceremonial way and restores his or her relationship with God (compare Romans 3:25; 8:3; 2 Corinthians 5:18–21). The whole burnt offering appears first in this list of offerings (Leviticus 1–7). It sets a pattern for the offerings that follow. It is the most common offering for atonement.