'Chaff' in the Bible

But the horde of invaders will be like fine dust, the horde of tyrants like chaff that is blown away. It will happen suddenly, in a flash.

His battle cry overwhelms like a flooding river that reaches one's neck. He shakes the nations in a sieve that isolates the chaff; he puts a bit into the mouth of the nations and leads them to destruction.

You conceive straw, you give birth to chaff; your breath is a fire that destroys you.