Exodus 29:13, 22

Take all the fat that covers the inner organs, as well as the best part of the liver, both kidneys, and the fat around them, and burn them on the altar.

“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.)