Exodus 29:22

Also thou shalt take of the ram the fat and the rump, the heavy tail of fat which is a characteristic of the sheep referred to, and the fat that covereth the inwards, the fat of the abdominal net, and the caul above the liver, and the two kidneys, and the fat that is upon them, and the right shoulder, "these parts representing the vigor of life, its comfort, and its conscientiousness," and the shoulder-piece being included here, though it otherwise belonged to the priests, for a special reason; for it is a ram of consecration. The priests here voluntarily returned to Jehovah a part of the emoluments belonging to them.