1 Kings 8:9-11

9There was nothing in the ark save the two tables of stone which Moses placed there at Horeb, when Jehovah made [a covenant] with the children of Israel, when they came out of the land of Egypt.

10And it came to pass when the priests were come out of the holy place, that the cloud filled the house of Jehovah,

11and the priests could not stand to do their service because of the cloud; for the glory of Jehovah had filled the house of Jehovah.