2 The Lord said to Moses, "Warn your brother, Aaron, not to enter the Most Holy Place behind the inner curtain whenever he chooses; if he does, he will die. For the Ark’s cover—the place of atonement—is there, and I myself am present in the cloud above the atonement cover.
12 he will fill an incense burner with burning coals from the altar that stands before the Lord. Then he will take two handfuls of fragrant powdered incense and will carry the burner and the incense behind the inner curtain. 13 There in the Lord’s presence he will put the incense on the burning coals so that a cloud of incense will rise over the Ark’s cover—the place of atonement—that rests on the Ark of the Covenant.16:13 Hebrew that is above the Testimony. The Hebrew word for "testimony" refers to the terms of the Lord’s covenant with Israel as written on stone tablets, which were kept in the Ark, and also to the covenant itself. If he follows these instructions, he will not die.
34 This is a permanent law for you, to purify the people of Israel from their sins, making them right with the Lord once each year."
Moses followed all these instructions exactly as the Lord had commanded him.