1 Kings 8:10

Now it happened as Aaron spoke to the whole congregation of the sons of Israel, that they turned toward the wilderness, and behold, the glory of Yahweh appeared in the cloud.

And Yahweh said to Moses: “Tell your brother Aaron that he shall not enter at any time into the holy place inside the veil, before the mercy seat which is on the ark, so that he will not die; for I will appear in the cloud over the mercy seat.

And the sanctuary was filled with smoke from the glory of God and from His power; and no one was able to enter the sanctuary until the seven plagues of the seven angels were finished.