Matthew 12:34
O vipers' brood, how can you speak what is good when you are evil? For it is from the overflow of the heart that the mouth speaks.
Acts 20:30
and that from among your own selves men will rise up who will seek with their perverse talk to draw away the disciples after them.
1 Timothy 5:13
And at the same time they also learn to be idle as they go round from house to house; and they are not only idle, but are gossips also and busybodies, speaking of things that ought not to be spoken of.
Titus 1:10-11
For there are many that spurn authority--idle, talkative and deceitful persons, who, for the most part, are adherents of the Circumcision.
James 1:21
Ridding yourselves, therefore, of all that is vile and of the evil influences which prevail around you, welcome in a humble spirit the Message implanted within you, which is able to save your souls.
James 3:6
And the tongue is a fire. That world of iniquity, the tongue, is placed within us spotting and soiling our whole nature, and setting the whole round of our lives on fire, being itself set on fire by Gehenna.