Leviticus 4:8-10

8And all the fat of the bull of the sin offering he shall remove from it, athe fat that covers the entrails and all the fat that is on the entrails 9 band the two kidneys with the fat that is on them at the loins and the long lobe of the liver that he shall remove with the kidneys 10(just as these are taken from the ox of the sacrifice of the peace offerings); and the priest shall burn them on the altar of burnt offering.
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