Leviticus 8:15-16

15And he
Probably Aaron or his representative; possibly Moses; also verses 16–23
killed it, and bMoses took the blood, and with his finger put it on the horns of the altar around it and purified the altar and poured out the blood at the base of the altar and consecrated it to make atonement for it.
16 cAnd he took all the fat that was on the entrails and the long lobe of the liver and the two kidneys with their fat, and Moses burned them on the altar.
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