1 Peter 3:15
and sanctify the anointed Lord in your hearts, and be always ready with a defense to every one that asks you a reason for the hope that is in you; but with meekness and fear,
Matthew 12:34
Offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart the mouth speaks.
Titus 1:10-11
For there are many disorderly wranglers and deceivers, especially those of the circumcision,
James 3:6-8
And the tongue is a fire, the tongue is made a world of wickedness among our members, it defiles the whole body and sets on fire the course of nature and is set on fire by hell.
2 Peter 2:18
For speaking extravagant words of vanity, they entice with carnal desires of lewdness those scarcely escaped from them, those living in error,