Exodus 29:14

29:14 But the meat of the bull, its skin, and its dung you are to burn up outside the camp. It is the purification offering.

Exodus 29:18

29:18 and burn the whole ram on the altar. It is a burnt offering to the Lord, a soothing aroma; it is an offering made by fire to the Lord.

Exodus 29:28

29:28 It is to belong to Aaron and to his sons from the Israelites, by a perpetual ordinance, for it is a contribution. It is to be a contribution from the Israelites from their peace offerings, their contribution to the Lord.