Leviticus 8:15-16

¹⁵He killed it; and Moses took the blood, and put it around on the horns of the altar with his finger, and purified the altar, and poured out the blood at the base of the altar, and sanctified it, to make atonement for it.

¹⁶He took all the fat that was on the innards, and the cover of the liver, and the two kidneys, and their fat; and Moses burnt it on the altar.