Exodus 29:22, 24, 26

“Then take the fat from the male sheep, the fat tail, and the fat that covers the inner organs. In addition, take the best part of the liver, both kidneys, and the fat around them, and the right thigh. (This is the male sheep to be used in appointing priests.)

Put all of these in the hands of Aaron and his sons, and tell them to present them as an offering to the LORD.

Then take the breast of the male sheep used to appoint Aaron as priest, and present it before the LORD as an offering. This part of the animal will be your share.