Leviticus 16:1-3 ▼

1 AND the LORD spoke to Moses after the death of the two sons of Aaron, when they offered strange fire before the LORD and died;

2 And the LORD said to Moses, Speak to Aaron your brother that he come not at all times into the holy place within the veil before the mercy seat which is upon the ark, that he die not; for I will appear in the cloud upon the mercy seat.

3 Thus shall Aaron come into the holy place: with a young bullock for a sin offering and a ram for a burnt offering.