And it shall come to pass in that day, saith the LORD, that I will cut off thy {k} horses out of the midst of thee, and I will destroy thy chariots:

(k) I will destroy all things in which you put your confidence, such as your vain self-reliance and idolatry, and in doing this I will be helping you.

Wesley's Notes

5:10 I will cut off - Not in judgment, but in mercy, for there shall be no need of them, nor shall the church of God any more rely on them. Thy chariots - Chariots prepared for war.

Jamieson-Fausset-Brown Bible Commentary

10. cut off thy horses . chariots-namely, those used for the purposes of war. Israel had been forbidden the use of cavalry, or to go to Egypt for horses (De 17:16), lest they should trust in worldly forces, rather than in God (Ps 20:7). Solomon had disregarded this command (1Ki 10:26, 28). Hereafter, saith God, I will remove these impediments to the free course of My grace: horses, chariots, &c., on which ye trust. The Church will never be safe, till she is stripped of all creature trusts, and rests on Jehovah alone [Calvin]. The universal peace given by God shall cause warlike instruments to be needless. He will cut them off from Israel (Zec 9:10); as she will cut them off from Babylon, the representative of the nations (Jer 50:37; 51:21).

Matthew Henry's Concise Commentary

5:7-15 The remnant of Israel, converted to Christ in the primitive times, were among many nations as the drops of dew, and were made instruments in calling a large increase of spiritual worshippers. But to those who neglected or opposed this salvation, they would, as lions, cause terror, their doctrine condemning them. The Lord also declares that he would cause not only the reformation of the Jews, but the purification of the Christian church. In like manner shall we be assured of victory in our personal conflicts, as we simply depend upon the Lord our salvation, worship him, and serve him with diligence.