And he revealed to you the covenant he has commanded you to keep, the ten commandments, writing them on two stone tablets.

Now at the end of the forty days and nights the Lord presented me with the two stone tablets, the tablets of the covenant.

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.