1 Peter 3:15
and be always ready to answer every one that asketh you a reason of the hope that is in you, with meekness and reverence:
Matthew 12:34
O race of vipers, how can ye speak good things, who are yourselves so wicked? for out of the abundance of the heart the mouth speaketh.
Titus 1:10-11
For there are many disorderly persons, vain-talkers and deceivers, especially those of the circumcision; whose mouths must be stopped:
James 3:6-8
And the tongue is a fire, a world of iniquity: so is the tongue among our several parts, defiling the whole body, inflaming the course of nature, and is set on fire by hell.
2 Peter 2:18
For when they speak swelling words of vanity, they ensnare in the lusts of the flesh, through their lasciviousness, those who had indeed withdrawn from such as deal in error;