Deuteronomy 17:18; Deuteronomy 17:19

18 "And when he sits on the throne of his kingdom, he shall write for himself in a book a copy of this law, approved by the Levitical priests.

19 And it shall be with him, and he shall read in it all the days of his life, that he may learn to fear the LORD his God by keeping all the words of this law and these statutes, and doing them,