Charles Ellicott Commentary Isaiah 26:5

"For he hath brought down them that dwell on high, the lofty city: he layeth it low, he layeth it low even to the ground; he bringeth it even to the dust." — Isaiah 26:5 (ASV)

The lofty city, he lays it low ... —The “city” is probably the great imperial “city of confusion” that had exalted itself against God and his people. To that city, Moab, in all its pride, was merely a tributary.