Leviticus 9:18-21

18He also slaughtered the bull and the ram as the sacrifice of fellowship offerings for the people. Then his sons brought him the blood, which he splashed around on the altar,

19as well as the fat from the bull and the ram, the fat tail, and the layer over the innards along with the kidneys and the covering of the liver.

20They put the fat upon the breasts, and he burned it on the altar.

21But the breasts and the right thigh Aaron waved for a wave offering before Adonai, as Moses had commanded.