Deuteronomy 17:15-17

Young's Literal Translation

¹⁵ thou dost certainly set over thee a king on whom Jehovah doth fix; from the midst of thy brethren thou dost set over thee a king; thou art not able to set over thee a stranger, who is not thy brother.

¹⁶ `Only, he doth not multiply to himself horses, nor cause the people to turn back to Egypt, so as to multiply horses, seeing Jehovah hath said to you, Ye do not add to turn back in this way any more.

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.