Deuteronomy 17:17-21

And he shall not acquire many wives for himself, so that his heart does not turn away; nor shall he greatly increase silver and gold for himself.

“Now it shall come about, when he sits on the throne of his kingdom, that he shall write for himself a copy of this Law on a scroll in the presence of the Levitical priests.

And it shall be with him, and he shall read it all the days of his life, so that he will learn to fear the Lord his God, by carefully following all the words of this Law and these statutes,

so that his heart will not be haughty toward his countrymen, and that he will not turn away from the commandment to the right or the left, so that he and his sons may live long in his kingdom in the midst of Israel.