Leviticus 7:3-5

And he shall offer of it all the fat thereof; the rump, and the fat that covereth the inwards, And the two kidneys, and the fat that {is} on them, which {is} by the flanks, and the caul {that is} above the liver, with the kidneys, it shall he take away: And the priest shall burn them upon the altar {for} an offering made by fire unto the LORD: it {is} a trespass offering.