Leviticus 3:15-19

and the two kidneys with the fat that is on them, which is on the loins, and the lobe of the liver, which he shall remove with the kidneys.

The priest shall offer them up in smoke on the altar as food, an offering by fire as a soothing aroma; all fat is the Lord’s.

It is a permanent statute throughout your generations in all your dwelling places: you shall not eat any fat or any blood.’ ”