Leviticus 16:12

“And he shall take a censer full of coals of fire from off the altar before Yahweh, and his hands full of sweet incense beaten small, and bring it within the veil,”

The next step before the blood can be presented within the veil is to prepare the way for his entry. He has already sacrificed the bull ox for his own sins. Now, prior to taking its blood behind the veil into the Holy of Holies, he must first take a censer full of coals from the altar into the Holy of Holies, with the sweet incense beaten small in his other hand, of the type laid down by Yahweh and specially prepared.