Ephesians 4:29
You must stop letting any bad word pass your lips, but only words that are good for building up as the occasion demands, so that they will result in spiritual blessing to the hearers.
Matthew 12:35-37
The good man out of his good inner storehouse, brings out good things, the bad man, out of his bad one, bad things.
Colossians 4:6
Always let your conversation be seasoned with salt, that is, with winsomeness, so that you may know how to make a fitting answer to everyone.
Titus 1:10-11
For there are many insubordinate people, mere talkers with nothing to say, but deceivers of their own minds, especially those of the circumcision party,
James 3:6-9
And the tongue is a fire, and takes its place among the parts of our bodies as a world of evil; it soils the whole body and sets on fire the circle of man's nature, and itself is set on fire by hell.
Romans 10:14-15
But how can people call upon One in whom they have not believed? And how can they believe in One about whom they have not heard? And how can people hear without someone to preach to them?
2 Corinthians 2:16
to the one a deadly perfume that leads to death, to the other a living perfume that leads to life.
2 Corinthians 11:15
So it is no surprise if his servants also masquerade as ministers for doing right, whose doom shall be in accordance with what they do.
2 Peter 2:18
For by uttering arrogant nonsense, through base desires of the lower nature, they entice into immorality men who are just escaping from those who live in error,