Exodus 25:14

25:14 and put the poles into the rings at the sides of the ark in order to carry the ark with them.

Exodus 25:21

25:21 You are to put the atonement lid on top of the ark, and in the ark you are to put the testimony I am giving you.

Exodus 40:21

40:21 And he brought the ark into the tabernacle, hung the protecting curtain, and shielded the ark of the testimony from view, just as the Lord had commanded Moses.