Leviticus 1:7-9

and the sons of Aaron the priest shall put fire on the altar and arrange wood on the fire. And Aaron’s sons the priests shall arrange the pieces, the head, and the fat, on the wood that is on the fire on the altar; but its entrails and its legs he shall wash with water. And the priest shall burn all of it on the altar, as a burnt offering, a food offering with a pleasing aroma to the LORD.