'Speech' in the Bible

But let your speech be, Yea, yea; Nay, nay: and whatsoever is more than these is of the evil one .

For out of the heart come evil thoughts and plans, murders, adulteries, sexual immoralities, thefts, false testimonies, slanders (verbal abuse, irreverent speech, blaspheming).

And after a while came unto him they that stood by, and said to Peter, Surely thou also art one of them; for thy speech bewrayeth thee.