Exodus 29:11, 16, 20

Then slaughter the bull in the LORD’s presence at the entrance of the Tabernacle.

Then slaughter the ram, and splatter its blood against all sides of the altar.

Then slaughter it, and apply some of its blood to the right earlobes of Aaron and his sons. Also put it on the thumbs of their right hands and the big toes of their right feet. Splatter the rest of the blood against all sides of the altar.