Leviticus 3:4-6

New Revised Standard Version Catholic Edition

⁴ the two kidneys with the fat that is on them at the loins, and the appendage of the liver, which he shall remove with the kidneys. ⁵ Then Aaron’s sons shall turn these into smoke on the altar, with the burnt offering that is on the wood on the fire, as an offering by fire of pleasing odor to the Lord.

⁶ If your offering for a sacrifice of well-being to the Lord is from the flock, male or female, you shall offer one without blemish.