Deuteronomy 17:18-19

VIN(i) 18 When he sits on the throne of his kingdom, he must write for himself a copy of this law in a book, out of that which is before the priests, the Levites. 19 And it shall be with him, and he shall read it all the days of his life, so that he may learn to revere the LORD your God by diligently observing all the word of this law and these rules,