But he shall not multiply horses to himself, nor cause the people to return to {k} Egypt, to the end that he should multiply horses: forasmuch as the LORD hath said unto you, Ye shall henceforth return no more that way.

(k) To avenge their injuries and to take their best horses from them; 1Ki 10:28.

Wesley's Notes

17:16 He shall not multiply horses - Tho' he might have horses for his own use, yet he was not to have many horses for his officers and guard, much less for war, lest he should trust in them. The multiplying horses is also forbidden, lest it should raise too great a correspondence with Egypt which furnished Canaan with them. The Lord hath said - The Lord hath now said to me, and I by his command declare it to you. Ye shall no more return that way - Into Egypt, lest ye be again infected with her idolatries.

Jamieson-Fausset-Brown Bible Commentary

16. he shall not multiply horses to himself-The use of these animals was not absolutely prohibited, nor is there any reason to conclude that they might not be employed as part of the state equipage. But the multiplication of horses would inevitably lead to many evils, to increased intercourse with foreign nations, especially with Egypt, to the importation of an animal to which the character of the country was not suited, to the establishment of an Oriental military despotism, to proud and pompous parade in peace, to a dependence upon Egypt in time of war, and a consequent withdrawal of trust and confidence in God. (2Sa 8:4; 1Ki 10:26; 2Ch 1:16; 9:28; Isa 31:3).

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.