Leviticus 3:9-10

And he shall offer of the sacrifice of the peace offering an offering made by fire unto the LORD; the fat thereof, {and} the whole rump, it shall he take off hard by the backbone; and the fat that covereth the inwards, and all the fat that {is} upon the inwards, And the two kidneys, and the fat that {is} upon them, which {is} by the flanks, and the caul above the liver, with the kidneys, it shall he take away.