1 Peter 3:15
but sanctify the Lord God in your hearts: and be always ready with your reply to every man who demands a reason respecting the hope which is in you with meekness and fear:
Matthew 12:34
Ye broods of vipers, how can ye speak good things, yourselves being wicked? for out of the abundance of the heart the mouth speaketh.
Titus 1:10-11
For there are many disorderly persons vainly talkative, and under a spirit of delusion, especially some of the circumcised;
James 3:6-8
And the tongue is a fire, a world of iniquity: in such manner is the tongue placed among our members, that it defileth all the body, and setteth on fire the circle of nature; and is set on fire of hell.
2 Peter 2:18
Uttering pompous discourses of inanity, ensnaring by the lusts of the flesh, by lascivious impurities, those who had truly escaped from such as live in a course of delusion.