Leviticus 3:3-4
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3He shall offer of the sacrifice of peace-offerings an offering made by fire to Yahweh; the fat that covers the inwards, and all the fat that is on the inwards, 4and the two kidneys, and the fat that is on them, which is by the loins, and the cover on the liver, with the kidneys, shall he take away.
Leviticus 3:3-4 (WEB)