1 Kings 8:9

8:9 There was nothing in the ark except the two stone tablets Moses had placed there in Horeb. It was there that the Lord made an agreement with the Israelites after he brought them out of the land of Egypt.

1 Kings 8:21

8:21 and set up in it a place for the ark containing the covenant the Lord made with our ancestors when he brought them out of the land of Egypt.”