Leviticus 4:34

31 Then he is to remove all the fat, just as it is removed from the peace offering, and the priest is to burn it on the altar as a pleasing aroma to the LORD. In this way the priest will make atonement for him, and he will be forgiven.

32 If, however, he brings a lamb as a sin offering, he must bring an unblemished female.

33 And he is to lay his hand on the head of the sin offering and slaughter it as a sin offering at the place where the burnt offering is slaughtered.

34 Then the priest is to take some of the blood of the sin offering with his finger, put it on the horns of the altar of burnt offering, and pour out the rest of its blood at the base of the altar.

35 And he shall remove all the fat, just as the fat of the lamb is removed from the peace offerings, and he shall burn it on the altar along with the offerings made by fire to the LORD. In this way the priest will make atonement for him for the sin he has committed, and he will be forgiven.