John Gill Commentary Isaiah 5:29

"their roaring shall be like a lioness, they shall roar like young lions; yea, they shall roar, and lay hold of the prey, and carry it away safe, and there shall be none to deliver." — Isaiah 5:29 (ASV)

Their roaring [shall be] like a lion When engaged in war, just seizing on their prey. The phrase denotes their fierceness and cruelty, and the horror they should inject into the hearts of their enemies.

they shall roar like young lions; that are hungry, and almost famished, and in sight of their prey; see (Job 4:10).

yea, they shall roar, and lay hold of the prey; seize it with great noise and greediness.

and shall carry [it] away safe; into their own den, the country from whence they come.

and none shall deliver [it]; this shows that respect is had; not to the Babylonish captivity, from whence there was a deliverance in a few years; but the Roman captivity, from thence there is no deliverance as yet to this day.