Leviticus 3:14-16

And of it let him make his offering, an offering made by fire to the Lord; the fat covering the inside parts and all the fat on the inside parts, And the two kidneys, with the fat on them, which is by the top part of the legs, and the fat joining the liver and the kidneys, let him take away; That it may be burned by the priest on the altar; it is the food of the offering made by fire for a sweet smell: all the fat is the Lord's.