Leviticus 3:13-15

¹³And he shall lay his hands on its head; and they shall slay it before the Lord by the doors of the tabernacle of witness; and the priests the sons of Aaron shall pour out the blood on the altar round about.

¹⁴And he shall offer of it a burnt offering to the Lord, even the fat that covers the belly, and all the fat that is on the belly.

¹⁵And both the kidneys, and all the fat that is upon them, that which is upon the thighs, and the caul of the liver with the kidneys, shall he take away.