Joel 1:6

A nation — An innumerable multitude of locusts and caterpillars, called a nation here, as Solomon calls the conies and the ant, Proverbs 30:25, and perhaps a prognostick of a very numerous and mighty nation, that ere long will invade Judah. Strong — Mighty in power, and undaunted in courage, if you refer it to the Assyrian or Babylonians; if to those vermin, they are, though each weak by itself, yet in those multitudes, strong and irresistible. A great lion — Such waste as lions make, these the locusts do, and the Assyrians will make.