Deuteronomy 31:24

“And it came to pass, when Moses had made an end of writing the words of this law in a book, etc.] In this book of Deuteronomy, and which concluded the Pentateuch: until they were finished; all the words of the law, and the whole five books of Moses, excepting some few verses, (<053401>Deuteronomy 34:1-12), which were added by another hand, Joshua or Ezra.”

“Moses completes the writing out of the book of the Law, and directs it to be placed by the ark of the covenant. Deuteronomy 31:24 The “book” here spoken of would contain the whole Pentateuch up to this verse, and be “the Book of Moses,” called generally by the Jews “the Law” (compare Matthew 22:40; Galatians 4:21). Deuteronomy 31:25 The Levites, which bare the ark - i. e., as in Deuteronomy 31:9, “the priests the sons of Levi.” The non-priestly Levites could not so much as enter the sanctuary or touch the ark (compare Numbers 4:15). Though in the journeys through the wilderness the ark was borne by the non-priestly Kohathites, yet on occasions of a more solemn and public character it was…”

“writing the words: Deu 31:9, Deu 17:18 Deuteronomy 31:25”

“With the installation of Joshua on the part of God, the official life of Moses was brought to a close. Having returned from the tabernacle, he finished the writing out of the laws, and then gave the book of the law to the Levites, with a command to put it by the side of the ark of the covenant, that it might be there for a witness against the people, as He knew its rebellion and stiffneckedness ( Deu 31:24-27). על־ספר כּתב, to write upon a book, equivalent to write down, commit to writing. תּמּם עד, till their being finished, i.e., complete. By the "Levites who bare the ark of the covenant" we are not to understand ordinary Levites, but the Levitical priests, who were entrusted with the ark.…”