Here are 4 Bible verses about your words from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Proverbs 18:21 KJV
Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.
Proverbs 13:3 KJV
He that keepeth his mouth keepeth his life: but he that openeth wide his lips shall have destruction.
Matthew 12:36-37 KJV
But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment. For by thy words thou shalt be justified, and by thy words thou shalt be condemned.
Acts 22:16 KJV
And now why tarriest thou? arise, and be baptized, and wash away thy sins, calling on the name of the Lord.