'Mouth' in the Bible

Do not be rash with your mouth, and do not let your heart be quick to utter a word before God. For God is in heaven, and you [are] on earth; therefore, let your words be few.

Do not let your mouth lead your flesh into sin, and do not tell the messenger that it [was] a mistake. Why anger God at your words, so that he destroys the work of your hands?

All of a man's toil [is] for his mouth-- yet his appetite is never satisfied.

The wise man [wins] favor by the words of his mouth, but the fool is devoured by his own lips.