'Mouth' in the Bible

Do not be hasty with your mouth [speaking careless words or vows] or impulsive in thought to bring up a matter before God. For God is in heaven and you are on earth; therefore let your words be few.

Do not allow your speech to cause you to sin, and do not say before the messenger (priest) of God that it was a mistake. Why should God be angry because of your voice (words) and destroy the work of your hands?

All the labor of man is for his mouth [for self-preservation and enjoyment], and yet the desire [of his soul] is not satisfied.

The words of a wise man’s mouth are gracious and win him favor, but the lips of a fool consume him;

the beginning of his talking is foolishness and the end of his talk is wicked madness.