Deuteronomy 17:16

Overview - Deuteronomy 17
The things sacrificed must be sound.
Idolaters must be slain.
Hard controversies are to be determined by the priests and judges.
12 The contemner of that determination must die.
14 The election;
16 and duty of a king.
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Deuteronomy 17:16  (King James Version)
But he shall not multiply horses to himself, nor cause the people to return to 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.

multiply horses
Multiplying horses for chariots of war and cavalry, or for luxury, would increase the splendour of a monarch, and form a ground of confidence distinct from a proper confidence in God, and inconsistent with it, and with considering him as the glory of Israel. Egypt abounded in horses; and the desire of multiplying these would induce the prince to encourage a trade with that kingdom; and this might make way for the Israelites being again subjugated by the Egyptians, or at least corrupted by their idolatries and vices. Whereas, it was the command of God that they should no more return thither, but be totally detached from them. Besides, they might be tempted to extend their dominion by means of cavalry, and so get scattered among the surrounding idolatrous nations, and thus cease to be that distinct, separate people, which God intended they should be.
1 Samuel 8:11 ; 2 Samuel 8:4 ; 1 Kings 1:5 ; 4:26 10:26-28 2 Chronicles 9:25 ; Psalms 20:7
Isaiah 36:8 Isaiah 36:9 ; Hosea 14:3

Isaiah 31:1-3 ; Jeremiah 42:14 ; Ezekiel 17:15

Ye shall henceforth
28:68 Exodus 13:17 ; 14:13 Numbers 14:3 Numbers 14:4 ; Jeremiah 42:15 Jeremiah 42:16 ; Hosea 11:5