Ephesians 4:29 NIV

1 Thessalonians 5:11 NIV
Therefore encourage one another and build each other up, just as in fact you are doing.

Colossians 3:16-17 NIV
Let the message of Christ dwell among you richly as you teach and admonish one another with all wisdom through psalms, hymns, and songs from the Spirit, singing to God with gratitude in your hearts. And whatever you do, whether in word or deed, do it all in the name of the Lord Jesus, giving thanks to God the Father through him.

Colossians 3:8-9 NIV
But now you must also rid yourselves of all such things as these: anger, rage, malice, slander, and filthy language from your lips. Do not lie to each other, since you have taken off your old self with its practices

Colossians 4:6 NIV
Let your conversation be always full of grace, seasoned with salt, so that you may know how to answer everyone.

Ecclesiastes 10:12 NIV
Words from the mouth of the wise are gracious, but fools are consumed by their own lips.

Ephesians 5:3-4 NIV
But among you there must not be even a hint of sexual immorality, or of any kind of impurity, or of greed, because these are improper for God’s holy people. Nor should there be obscenity, foolish talk or coarse joking, which are out of place, but rather thanksgiving.

James 3:2-8 NIV
We all stumble in many ways. Anyone who is never at fault in what they say is perfect, able to keep their whole body in check. When we put bits into the mouths of horses to make them obey us, we can turn the whole animal. Or take ships as an example. Although they are so large and are driven by strong winds, they are steered by a very small rudder wherever the pilot wants to go. Likewise, the tongue is a small part of the body, but it makes great boasts. Consider what a great forest is set on fire by a small spark. The tongue also is a fire, a world of evil among the parts of the body. It corrupts the whole body, sets the whole course of one’s life on fire, and is itself set on fire by hell. All kinds of animals, birds, reptiles and sea creatures are being tamed and have been tamed by mankind, but no human being can tame the tongue. It is a restless evil, full of deadly poison.

Matthew 12:34-37 NIV
You brood of vipers, how can you who are evil say anything good? For the mouth speaks what the heart is full of. A good man brings good things out of the good stored up in him, and an evil man brings evil things out of the evil stored up in him. But I tell you that everyone will have to give account on the day of judgment for every empty word they have spoken. For by your words you will be acquitted, and by your words you will be condemned.”

Matthew 5:16 NIV
In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven.

Proverbs 10:31-32 NIV
From the mouth of the righteous comes the fruit of wisdom, but a perverse tongue will be silenced. The lips of the righteous know what finds favor, but the mouth of the wicked only what is perverse.