TSK · Leviticus 3:15

All its fat he shall take away, like the fat is taken away from off of the sacrifice of peace offerings; and the priest shall burn it on the altar for a pleasant aroma to Yahweh; and the priest shall make atonement for him, and he will be forgiven.

Also the burnt offerings were in abundance, with the fat of the peace offerings, and with the drink offerings for every burnt offering. So the service of the house of Yahweh was set in order.