Albert Barnes Commentary Isaiah 5:27

"None shall be weary nor stumble among them; none shall slumber nor sleep; neither shall the girdle of their loins be loosed, nor the latchet of their shoes be broken:" — Isaiah 5:27 (ASV)

None shall be weary - In this verse and the following, the prophet describes the condition of the army that would be summoned to the destruction of Judea. It would be composed of bold, vigorous, courageous men; they would be unwearied by long and painful journeys; they would be fierce and violent; they would come fully prepared for conquest. None would be “weary,” that is, fatigued with long marches, or with hard service (Deuteronomy 25:18; 2 Samuel 16:14).

Nor stumble - They shall be chosen, select men; not those who are defective, or who shall easily fall by any impediments in the way of their march.

None shall slumber - They shall be unwearied and indefatigable, pursuing their purpose with ever watchful vigilance—so much so that they are not off their guard. They cannot be taken by surprise.

Neither shall the girdle of their loins be loosed - The ancients wore a loose, large, flowing robe, or upper garment. When they labored or ran, it was necessary to “gird” this up around the body, or to lay it aside altogether. The form of expression here may mean that they will not relax their efforts; they will not unloose their girdle; they will not unfit themselves for vigorous action and for battle. “In” that girdle, with which they bound up their robes, the Orientals usually carried their dirks and swords (Ezekiel 22:15). It means that they would be fully, and at all times, prepared for action.

Nor the latchet of their shoes be broken - They will be constantly prepared for marches. The shoes, sandals, or “soles” were attached to the feet, not by upper leather, but were girded on by thongs or strings (see the notes at Matthew 3:2).