Isaiah 5:27

ESV None is weary, none stumbles, none slumbers or sleeps, not a waistband is loose, not a sandal strap broken;
NIV Not one of them grows tired or stumbles, not one slumbers or sleeps; not a belt is loosened at the waist, not a sandal strap is broken.
NASB No one in it is tired or stumbles, No one slumbers or sleeps; Nor is the undergarment at his waist loosened, Nor his sandal strap broken.
CSB None of them grows weary or stumbles; no one slumbers or sleeps. No belt is loose and no sandal strap broken.
NLT They will not get tired or stumble. They will not stop for rest or sleep. Not a belt will be loose, not a sandal strap broken.
KJV 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:

What does Isaiah 5:27 mean?

The Lord will use outside nations to punish his people, Israel. Isaiah continues painting the picture: the Lord will whistle, and His attack dog will come rushing toward Israel (Isaiah 5:26). That attack dog is the army of a mighty nation far away. Which nation it will be did not matter enough to Isaiah to include. Ultimately, it is the Lord who is doing the striking. He will merely make use of a foreign power to make it happen.

The army that comes running is not a sloppy one. It is a well-oiled machine with few weaknesses. Not a single soldier is tired or stumbling or falling asleep along the way. Their belts are cinched tight, meaning that their robes are secured for running. Their sandals are well-maintained and fit for covering long distances. They are coming without hesitation. Just as Israel had been "preparing" by stacking up sins (Isaiah 5:18–20), this army is well-suited to their task of destruction.
What is the Gospel?
Download the app: