James 3:2 KJV

1 Peter 3:10 KJV
For he that will love life, and see good days, let him refrain his tongue from evil, and his lips that they speak no guile:

James 1:26 KJV
If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain.

James 3:5-6 KJV
Even so the tongue is a little member, and boasteth great things. Behold, how great a matter a little fire kindleth! And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell.

Matthew 12:37 KJV
For by thy words thou shalt be justified, and by thy words thou shalt be condemned.

Proverbs 13:3 KJV
He that keepeth his mouth keepeth his life: but he that openeth wide his lips shall have destruction.