Exodus 29:13

29:13 You are to take all the fat that covers the entrails, and the lobe that is above the liver, and the two kidneys and the fat that is on them, and burn them on the altar.

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.