Leviticus 3:15-17

New Revised Standard Version Catholic Edition

¹⁵ the two kidneys with the fat that is on them at the loins, and the appendage of the liver, which you shall remove with the kidneys. ¹⁶ Then the priest shall turn these into smoke on the altar as a food offering by fire for a pleasing odor.

All fat is the Lord’s. ¹⁷ It shall be a perpetual statute throughout your generations, in all your settlements: you must not eat any fat or any blood.