'Mouth of Fools' in the Bible

The tongue of the wise uttereth knowledge aright; But the mouth of fools poureth out folly.

The heart of him that hath understanding seeketh knowledge; But the mouth of fools feedeth on folly.

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

As a thorn that goeth up into the hand of a drunkard, So is a parable in the mouth of fools.