Leviticus 9:17-21

¹⁷And he brought the sacrifice and filled his hands with it, and laid it on the altar, besides the morning whole-burnt-offering.

¹⁸And he slew the calf, and the ram of the sacrifice of peace-offering of the people; and the sons of Aaron brought the blood to him, and he poured it out on the altar round about.

¹⁹And he took the fat of the calf, and the hind quarters of the ram, and the fat covering the belly, and the two kidneys, and the fat upon them, and the caul on the liver.

²⁰And he put the fat on the breasts, and offered the fat on the altar.

²¹And Aaron separated the breast and the right shoulder as a choice-offering before the Lord, as the Lord commanded Moses.