'Chaff' in the Bible

The nations rush as the rushing of many waters; but he will rebuke them, and they shall flee far away, and shall be chased as the chaff of the mountains before the wind, and like a whirling of dust before the whirlwind:

And the multitude of thine enemies shall be like small dust, and the multitude of the terrible ones as chaff that passeth away; and it shall be in an instant, suddenly.

Behold, I have made of thee a new sharp threshing instrument having double teeth: thou shalt thresh and beat small the mountains, and shalt make the hills as chaff;