Leviticus 7:1-5

“Now this is the law of the guilt  offering;  it is especially holy. The guilt offering is to be slaughtered at the place where the burnt offering  is slaughtered, and the priest is to splatter its blood on all sides of the altar. The offerer is to present all the fat from it: the fat tail,  the fat surrounding the entrails,  and the two kidneys with the fat on them at the loins; he will also remove the fatty lobe of the liver  with the kidneys. The priest will burn them on the altar as a food offering  to the Lord; it is a guilt offering.