Deuteronomy 17:17-19

Young's Literal Translation

¹⁷ And he doth not multiply to himself wives, and his heart doth not turn aside, and silver and gold he doth not multiply to himself -- exceedingly.

¹⁸ `And it hath been, when he sitteth on the throne of his kingdom, that he hath written for himself the copy of this law, on a book, from [that] before the priests the Levites,

¹⁹ and it hath been with him, and he hath read in it all days of his life, so that he doth learn to fear Jehovah his God, to keep all the words of this law, and these statutes, to do them;