Deuteronomy 31:25

25 then he charged the Levites who bear the ark of the covenant of the Lord, saying,

Deuteronomy 31:25 Meaning and Commentary

Deuteronomy 31:25

That Moses commanded the Levites
These were not the common Levites, but the priests who were also Levites, to whom the law was given, ( Deuteronomy 31:9 ) ; and none but they might touch the ark, or go so near it as, they are bid to do, to put the law on the side of it; so Aben Ezra; it follows,

which bare the ark of the covenant of the Lord;
as the priests are said to do, (See Gill on Deuteronomy 31:9); for though in journeying the Kohathites carried it, yet not until it was covered by the priests, for they must not touch it; as these must do when they put the law on the side of it, as they are ordered in ( Deuteronomy 31:26 ) .

saying;
as follows.

Deuteronomy 31:25 In-Context

23 And he charged Joshua, and said, Be courageous and strong, for thou shalt bring the sons of Israel into the land, which the Lord sware to them, and he shall be with thee.
24 And when Moses finished writing all the words of this law in a book, even to the end,
25 then he charged the Levites who bear the ark of the covenant of the Lord, saying,
26 Take the book of this law, and ye shall put it in the side of the ark of the covenant of the Lord your God; and it shall be there among you for a testimony.
27 For I know thy provocation, and thy stiff neck; for yet during my life with you at this day, ye have been provoking in your conduct toward God: how shall ye not also be so after my death?

The Brenton translation of the Septuagint is in the public domain.