Deuteronomy 17:18-20

And it shall be, when he sitteth upon the throne of his kingdom, that he shall write him a copy of this law in a book out of {that which is} before the priests the Levites: And it shall be with him, and he shall read therein all the days of his life: that he may learn to fear the LORD his God, to keep all the words of this law and these statutes, to do them: That his heart be not lifted up above his brethren, and that he turn not aside from the commandment, {to} the right hand, or {to} the left: to the end that he may prolong {his} days in his kingdom, he, and his children, in the midst of Israel.