Leviticus 4:8-10

ISV(i) 8 Then he is to remove all the fat from the bull for a sin offering—that is, the fat that covers the internal organs, all of the fat that is inside the internal organs, 9 the two kidneys with the fat on them by the loins, and the fatty mass surrounding the liver and kidneys— 10 just as it is taken from the bull for a peace offering. Then the priest is to burn it on the altar for burnt offerings.