Proverbs 13:3

James 1:26 NIV
Those who consider themselves religious and yet do not keep a tight rein on their tongues deceive themselves, and their religion is worthless.

Matthew 12:36-37 NIV
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.”

Proverbs 10:19 NIV
Sin is not ended by multiplying words, but the prudent hold their tongues.

Proverbs 12:13 NIV
Evildoers are trapped by their sinful talk, and so the innocent escape trouble.

Proverbs 18:21 NIV
The tongue has the power of life and death, and those who love it will eat its fruit.

Proverbs 18:7 NIV
The mouths of fools are their undoing, and their lips are a snare to their very lives.

Proverbs 20:19 NIV
A gossip betrays a confidence; so avoid anyone who talks too much.

Proverbs 21:23 NIV
Those who guard their mouths and their tongues keep themselves from calamity.