Leviticus 9:18-21

18He slew also the bullock and the ram for a sacrifice of peace offerings, which was for the people: and Aaron’s sons presented unto him the blood, which he sprinkled upon the altar round about,

19And the fat of the bullock and of the ram, the rump, and that which covereth the inwards, and the kidneys, and the caul above the liver:

20And they put the fat upon the breasts, and he burnt the fat upon the altar:

21And the breasts and the right shoulder Aaron waved for a wave offering before Yhwh; as Moses commanded.