Exodus:25:21-22
rsv@Exodus:25:21 @ 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.
rsv@Exodus:25:22 @ There I will meet with you, and from above the mercy seat, from between the two cherubim that are upon the ark of the testimony, I will speak with you of all that I will give you in commandment for the people of Israel.