Leviticus 1:7-9

7And the sons of Aaron the priest shall put fire on the altar, and lay wood in order on the fire;

8and Aaron's sons, the priests, shall lay the pieces, the head, and the fat, in order on the wood that is on the fire which is on the altar;

9but its inwards and its legs shall he wash in water; and the priest shall burn all on the altar, a burnt-offering, an offering by fire to Jehovah of a sweet odour.