'Mouth of Fools' in the Bible

The tongue of the wise uses knowledge rightly, but the mouth of fools pours out foolishness.

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

The legs of the lame are not equal; so is a parable in the mouth of fools.

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