Leviticus 9:12

‘And he shall slaughter it on the side of the altar northward before Yahweh, and Aaron’s sons the priests shall splash its blood around on the altar.

Then Aaron’s sons brought the blood near to him; and he dipped his finger in the blood and put some on the horns of the altar and poured out the rest of the blood at the base of the altar.

But Aaron spoke to Moses, “Behold, this very day they brought near their sin offering and their burnt offering before Yahweh. Then things like these happened to me. So if I had eaten a sin offering today, would it have been good in the sight of Yahweh?”