wholly of blue - Compare Exodus 25:4 note. The third and external covering of the ark only was to be of this color. The table of showbread had Numbers 4:8 an outer wrapping of scarlet; the altar Numbers 4:13 one of purple.
Put in the staves - Probably, "put the staves in order." These were never taken out of the golden rings by which the ark was to be borne (see Exodus 25:14-15), but would need adjustment.

And shall put thereon the covering of badgers' skins, and shall spread over [it] a cloth wholly of blue, and shall put in (c) the staves thereof.
(c) That is, put them on their shoulders to carry it: for the bars of the ark could never be removed.

And shall put thereon the covering of badgers' skins,.... Not that which covered the tabernacle, for that was committed to the Gershonites, Numbers 4:25; but a covering made of these on purpose for the present use, to preserve the ark from rain and dust; and this covering was put not immediately upon the ark, but upon the other coverings that were over the ark, and so preserved the vail as well as the ark:
and shall spread over it a cloth wholly of blue; it is a matter of question, whether this was over the covering of badgers' skins also; if over the latter, as one would think it should be, by the order of the text, how could that be a shelter from the rain and dust, which seems to be the use of it, and therefore should be the outermost, as one of the same kind was the outermost covering of the tabernacle? Aben Ezra observes, there were some that say it was over the covering of badger's skin, but it is right in mine eyes, says he, that it was spread over the covering vail; if indeed it was for the sake of honour and dignity, the first is right, but the badger's skin was on account of rain and dust:
and shall put in the staves thereof: having been removed while the ark was covering, as Aben Ezra observes, or otherwise they always remained in their rings, and were never taken out, Exodus 25:14; but on this occasion they might, and then be put in again for the carrying of the ark, which was the use of them; though he also remarks, that there are some that say the sense is, they put the staves on the shoulders of them that carried it, which is not a despicable sense; unless rather it is to be understood of putting the staves through holes made in the coverings of the ark, and disposing and fitting them in them, for the better carriage of it.

covering of badgers' skins--(See on Exodus 25:5). The covering, however, referred to was not that of the tabernacle, but one made for the special purpose of protecting the ark.
put in the staves--These golden staves were now taken out. (See on Exodus 25:15, compared with 1-Kings 8:8). The Hebrew word rendered "put in," signifies also "dispose," and probably refers here to their insertion through the openings in the coverings made for receiving them, to preserve them from the touch of the carriers as well as from the influence of the weather. It is worthy of notice that the coverings did not consist of canvas or coarse tarpaulin, but of a kind which united beauty with decency.

Badgers - skins - Whereby the ark was secured from the injuries of the weather.