When thou art come unto the land which the LORD thy God giveth thee, and shalt possess it, and shalt dwell therein, and shalt say, I will set a king over me, like as all the nations that are about me;

Jamieson-Fausset-Brown Bible Commentary

De 17:14-20. The Election and Duty of a King.

14. When thou . shalt say, I will set a king over me-In the following passage Moses prophetically announces a revolution which should occur at a later period in the national history of Israel. No sanction or recommendation was indicated; on the contrary, when the popular clamor had effected that constitutional change on the theocracy by the appointment of a king, the divine disapproval was expressed in the most unequivocal terms (1Sa 8:7). Permission at length was granted, God reserving to Himself the nomination of the family and the person who should be elevated to the regal dignity (1Sa 9:15; 10:24; 16:12; 1Ch 28:4). In short, Moses foreseeing that his ignorant and fickle countrymen, insensible to their advantages as a peculiar people, would soon wish to change their constitution and be like other nations, provides to a certain extent for such an emergency and lays down the principles on which a king in Israel must act. He was to possess certain indispensable requisites. He was to be an Israelite, of the same race and religion, to preserve the purity of the established worship, as well as be a type of Christ, a spiritual king, one of their brethren.

Matthew Henry's Concise Commentary

17:14-20 God himself was in a particular manner Israel's King; and if they set another over them, it was necessary that he should choose the person. Accordingly, when the people desired a king, they applied to Samuel, a prophet of the Lord. In all cases, God's choice, if we can but know it, should direct, determine, and overrule ours. Laws are given for the prince that should be elected. He must carefully avoid every thing that would turn him from God and religion. Riches, honours, and pleasures, are three great hinderances of godliness, (the lusts of the flesh, the lusts of the eye, and the pride of life,) especially to those in high stations; against these the king is here warned. The king must carefully study the law of God, and make that his rule; and having a copy of the Scriptures of his own writing, must read therein all the days of his life. It is not enough to have Bibles, but we must use them, use them daily, as long as we live. Christ's scholars never learn above their Bibles, but will have constant occasion for them, till they come to that world where knowledge and love will be made perfect. The king's writing and reading were as nothing, if he did not practise what he wrote and read. And those who fear God and keep his commandments, will fare the better for it even in this world.