Deuteronomy 31:9

Ver. 9. And Moses wrote this law— i.e. says Houbigant, what he had before addressed to the people; not the whole Pentateuch, which, he says, is never understood by the word law in the books of Moses. As, however, in other parts of Scripture, the word is so understood, many interpreters think that the whole Pentateuch is here meant. Galatians 4:21. Nehemiah 10:35. 2 Kings 23:24. 2 Chronicles 31:3. This law he delivered to the priests the sons of Levi, to be placed in the ark, and to be read to the people every seventh year; which seems a convincing proof, that the whole five books of Moses are meant.