Ephesians 4:29
Let no foul language proceed out of your mouth, but whatever is good for edification, as the need may be, that it may benefit the hearers;
Matthew 12:35-37
The good man, from his good treasure, bringeth out good things; and the evil man, from his evil treasure, bringeth out evil things.
Colossians 4:6
Let your speech be always with grace, seasoned with salt, that ye may know how ye ought to answer every one.
Titus 1:10-11
For there are many unruly vain talkers and deceivers, especially they of the circumcision;
James 3:6-9
And the tongue is a fire, a world of iniquity! The tongue among our members is that which defileth the whole body, and setteth on fire the wheel of life, and is itself set on fire by hell.
Romans 10:14-15
How then shall they call on him, in whom they have not believed? and how shall they believe in him, of whom they have not heard? and how shall they hear without a preacher?
2 Corinthians 2:16
to the latter we are the odor of death, producing death; and to the former the odor of life, producing life. And who is sufficient for these things?
2 Corinthians 11:15
It is no great thing, then, if his ministers also transform themselves as ministers of righteousness; whose end shall be according to their works.
2 Peter 2:18
For speaking great swelling words of vanity, they allure in the lusts of the flesh, by dissolute ways, such as were in some measure escaping from those who live in error;