Leviticus 3:9

And he shall offer of the sacrifice of the peace-offering an offering made by fire unto the Lord, that portion of the sacrificial victim burned upon the altar being known as the food of Jehovah and signifying the communion between Him and the worshiper brought about by the sacrifice; the fat thereof and the whole rump, the heavy fat-tail which is characteristic of a certain variety of sheep in Arabia and Palestine, 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, as in the case of the larger animal. v. 3,