Proverbs 10:6

10:6 Blessings are on the head of the righteous,

but the speech of the wicked conceals violence.

Psalms 107:42

107:42 When the godly see this, they rejoice,

and every sinner shuts his mouth.

Ecclesiastes 10:12-14

Words and Works of Wise Men and Fools

10:12 The words of a wise person win him favor,

but the words of a fool are self-destructive.

10:13 At the beginning his words are foolish

and at the end his talk is wicked madness,

10:14 yet a fool keeps on babbling.

No one knows what will happen;

who can tell him what will happen in the future?

Matthew 12:34-37

12:34 Offspring of vipers! How are you able to say anything good, since you are evil? For the mouth speaks from what fills the heart. 12:35 The good person brings good things out of his good treasury, and the evil person brings evil things out of his evil treasury. 12:36 I tell you that on the day of judgment, people will give an account for every worthless word they speak. 12:37 For by your words you will be justified, and by your words you will be condemned.”

James 3:5-8

3:5 So too the tongue is a small part of the body, yet it has great pretensions. Think how small a flame sets a huge forest ablaze. 3:6 And the tongue is a fire! The tongue represents the world of wrongdoing among the parts of our bodies. It pollutes the entire body and sets fire to the course of human existence – and is set on fire by hell.

3:7 For every kind of animal, bird, reptile, and sea creature is subdued and has been subdued by humankind. 3:8 But no human being can subdue the tongue; it is a restless evil, full of deadly poison.