Matthew 12:34 O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Proverbs 18:21 Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.
Ephesians 4:29 Let no corrupt communication proceed out of your mouth, but that which is good to the use of edifying, that it may minister grace unto the hearers.
Romans 10:10 10 For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.