Deuteronomy 17:15-17

Revised Standard Version

¹⁵ you may indeed set as king over you him whom the Lord your God will choose. One from among your brethren you shall set as king over you; you may not put a foreigner over you, who is not your brother. ¹⁶ Only he must not multiply horses for himself, or cause the people to return to Egypt in order to multiply horses, since the Lord has said to you, ‘You shall never return that way again.’ ¹⁷ And he shall not multiply wives for himself, lest his heart turn away; nor shall he greatly multiply for himself silver and gold.