Leviticus 16:1-2

World English Bible

16 Yahweh spoke to Moses after the death of the two sons of Aaron, when they came near before Yahweh, and died; ² and Yahweh said to Moses, “Tell Aaron your brother not to come at just any time into the Most Holy Place within the veil, before the mercy seat which is on the ark; lest he die; for I will appear in the cloud on the mercy seat.