Exodus 29:15-18

15“And you shall take one of the rams, and Aaron and his sons shall lay their hands on the head of the ram;

16then you shall kill the ram and you shall take its blood and sprinkle it around the altar [of burnt offering].

17Then you shall cut the ram into pieces, and wash its intestines and legs, and place them with its pieces and its head,

18and you shall burn the whole ram on the altar. It is a burnt offering to the Lord: it is a sweet and soothing aroma, an offering by fire to the Lord.