'Chaff' in the Bible

The lips of the wise spread knowledge [sifting it as chaff from the grain];But the hearts of [shortsighted] fools are not so.

A [discerning] king who sits on the throne of judgmentSifts all evil [like chaff] with his eyes [and cannot be easily fooled].

A wise king sifts out the wicked [from among the good]And drives the [threshing] wheel over them [to separate the chaff from the grain].