1 Kings 8:9-11

Young's Literal Translation

⁹ There is nothing in the ark, only the two tables of stone which Moses put there in Horeb, when Jehovah covenanted with the sons of Israel in their going out of the land of Egypt.

¹⁰ And it cometh to pass, in the going out of the priests from the holy [place], that the cloud hath filled the house of Jehovah,

¹¹ and the priests have not been able to stand to minister because of the cloud, for the honour of Jehovah hath filled the house of Jehovah.