Exodus 40:20

20 Moses took the testimony and placed [it] in the ark, and attached the poles to the ark. He set the mercy seat on top of the ark.

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 set up the tabernacle: he laid its bases, positioned its planks, inserted its crossbars, and set up its posts.

19 Then he spread the tent over the tabernacle and put the covering of the tent on top of it, just as the Lord had commanded Moses.

20 Moses took the testimony and placed [it] in the ark, and attached the poles to the ark. He set the mercy seat on top of the ark.

21 He brought the ark into the tabernacle, put up the veil for the screen, and screened off the ark of the testimony, just as the Lord had commanded him.

22 Moses placed the table in the tent of meeting on the north side of the tabernacle, outside the veil.