Exodus 40:20

20 Then he took the two stone tablets and put them in the Covenant Box. He put the poles in the rings of the Box and put the lid on it.

Exodus 40:20 Meaning and Commentary

Exodus 40:20

And he took and put the testimony into the ark
The ten commands, called the "testimony", because they testified and declared what was the will of God with respect to things to be done, or not done. The Targum of Jonathan says, he put the broken pieces of the tables into it; but what became of them, or were done with them, we nowhere read; and it does not appear that any other, but those that Moses hewed by the order of God, were put into the ark; see ( Deuteronomy 10:1-5 )

and set the staves on the ark;
that it might be ready to be carried whenever a remove was necessary:

and put the mercy seat above upon the ark;
together with the cherubim.

Exodus 40:20 In-Context

18 Moses put down its bases, set up its frames, attached its crossbars, and put up its posts.
19 He spread out the covering over the Tent and put the outer covering over it, just as the Lord had commanded.
20 Then he took the two stone tablets and put them in the Covenant Box. He put the poles in the rings of the Box and put the lid on it.
21 Then he put the Box in the Tent and hung up the curtain. In this way he screened off the Covenant Box, just as the Lord had commanded.
22 He put the table in the Tent, on the north side outside the curtain,
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.