Melachim Alef 8:9-11

Orthodox Jewish Bible

⁹ There was nothing in the Aron except the two Luchot HaAvanim (Tablets of Stone), which Moshe placed there at Chorev, when Hashem cut a Brit with the Bnei Yisroel, when they came out of Eretz Mitzrayim.

¹⁰ And it came to pass, when the Kohanim were come out of the Kodesh, that the anan filled the Beis Hashem,

¹¹ So that the Kohanim could not stand up to minister because of the anan; for the Kavod Hashem had filled the Beis Hashem.