Leviticus 4:7-9

⁷The priest shall put some of the blood on the horns of the altar of aromatic incense that stands before the Lord in the Tent of Meeting. The rest of the bull's blood he is to pour out at the bottom of the altar of burnt offering at the entrance to the Tent of Meeting.

⁸Then he shall remove all the fat from the bull of the sin offering: all the fat that covers the insides,

⁹both kidneys with the fat on them by the loins, and the best part of the liver, which he is to remove together with the kidneys