Leviticus 9:18-22

¹⁸Then he slaughtered the ox and the ram, to be an offering for the Israeli people to maintain fellowship with Yahweh. His sons handed him the bowl containing the blood, and he sprinkled the blood against all sides of the altar.

¹⁹But he took the fat from the ox and the ram, including their fat tails that were cut close to the backbone, and all the fat that covered the livers and the kidneys.

²⁰He put them on top of the breasts of those animals and carried them to the altar to be burned.

²¹Then, doing what Moses/I had commanded, he lifted up in front of Yahweh the breast and the right thigh of those animals, to signify that those two animals completely belonged to Yahweh.

²²Then Aaron lifted his arms toward the people and asked Yahweh to bless them. Then having finished making all those offerings, he stepped down from the place where the altar was.