Ephesians 4:29
Let no evil word proceed out of your mouth, but that which is good for useful edification, that it may afford benefit to those that hear.
Matthew 12:35-37
The good man, out of his good treasury, casts forth good things; and the evil man, out of his evil treasury, casts forth evil things.
Colossians 4:6
Let your words always be with kindness, seasoned with salt, that you may know how to answer every one.
Titus 1:10-11
For there are many disorderly wranglers and deceivers, especially those of the circumcision,
James 3:6-9
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.
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 one preaching?
2 Corinthians 2:16
in one an odor of death to death, and in the other an odor of life to life. And who is sufficient for these things?
2 Corinthians 11:15
It is no great thing, therefore, if his ministers transform themselves as ministers of righteousness, whose end will be according to their works.
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,