'Mouth of Fools' in the Bible

The tongue of the wise utters knowledge rightly, but the mouth of fools pours out folly.

The heart of him who has understanding seeks knowledge, but the mouth of fools feeds on folly.

The legs of a lame man hang loose. So is a parable in the mouth of fools.

[As] a thorn that goes up into the hand of a drunkard, so is a parable in the mouth of fools.