Exodus 40:20 in the King James Version
And he took and put the testimony into the ark, and set the staves on the ark, and put the mercy seat above upon the ark:
Context
19 He spread the covering over the tent, and put the roof of the tabernacle above on it, as the LORD commanded Moses.
20 He took and put the covenant into the ark, and set the poles on the ark, and put the mercy seat above on the ark.
21 He brought the ark into the tabernacle, and set up the veil of the screen, and screened the ark of the covenant, as the LORD commanded Moses.