Exodus 25:21; Exodus 25:22

21 And you shall put the mercy seat on the top of the ark, and in the ark you shall put the testimony that I shall give you.

22 There I will meet with you, and from above the mercy seat, from between the two cherubim that are on the ark of the testimony, I will speak with you about all that I will give you in commandment for the people of Israel.