ישעיהו, פרק ה׳, פסוק כ״ז

The invading enemy army advances as an organized, professional, and unstoppable force, making its way with immense speed and determination. Moving without a single delay, the troops press forward relentlessly.

The soldiers experience neither internal exhaustion nor external setbacks. They do not suffer from inner fatigue, nor do they stumble over obstacles along the way [שד״ל]. No outside factor slows their march [מלבי״ם], and they show no signs of laziness or weakness as they run [רש״י, מצודת דוד].

Their fierce determination pushes them past normal physical limits. They avoid both light, temporary dozing brought on by momentary tiredness, and the deep, natural sleep that every human being requires. Eager to reach their destination, the soldiers conquer the basic human need for rest, marching continuously through the day and night [אבן עזרא, מלבי״ם, אברבנאל].

This supreme level of readiness extends to their gear. The primary approach among commentators is that the soldiers will not face even the slightest technical delay. Their belts will not loosen on their own. While some explain that their shoelaces will simply not untie [רד״ק], others emphasize that the laces will not tear or break, ensuring the troops never have to stop for repairs [שד״ל, מלבי״ם]. A complementary approach views this through the lens of their daily routine. Since the soldiers forgo regular sleep, they never undress. They remain fully clothed, belted, and with their shoes securely fastened at all times. This constant state of readiness highlights their immense diligence and intense desire to reach the battle fully prepared at any given moment [אברבנאל].