John Gills Exposition of the Bible Commentary - Deuteronomy 31:9
And Moses wrote this law ,.... The book of Deuteronomy, or the Pentateuch, the five books of Moses, which he had now finished, and which all of them together are sometimes called the law, Galatians 4:21 , and delivered it unto the priests, the sons of Levi ; who were the teachers of the law, as Aben Ezra observes; see Malachi 2:7 ; and therefore it was proper to put it into their hands, to instruct the people in it, and that the people might apply to them in any matter of difficulty,... read more
Matthew Henry's Complete Commentary - Deuteronomy 31:9-13
The law was given by Moses; so it is said, John 1:17. He was not only entrusted to deliver it to that generation, but to transmit it to the generations to come; and here it appears that he was faithful to that trust. I. Moses wrote this law, Deut. 31:9. The learned bishop Patrick understands this of all the five books of Moses, which are often called the law; he supposes that though Moses had written most of the Pentateuch before, yet he did not finish it till now; now he put his last hand to... read more