Deuteronomy 17:16-20

16Further, he shall not acquire many [war] horses for himself, nor make the people return to Egypt in order to acquire horses [to expand his military power], since the Lord said to you, ‘You shall never return that way again.’

17He shall not acquire multiple wives for himself, or else his heart will turn away [from God]; nor [for the same reason] shall he acquire great amounts of silver and gold.

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

19And it shall be with him and he shall read it all the days of his life, so that he may learn to fear [and worship] the Lord his God [with awe-filled reverence and profound respect], by carefully obeying (keeping foremost in his thoughts and actively doing) all the words of this law and these statutes,

20so that his heart will not be lifted up above his countrymen [by a false sense of self-importance and self-reliance] and that he will not turn away (deviate) from the commandment, to the right or to the left, so that he and his sons may continue [to reign] for a long time in his kingdom in Israel.