Matthew 12:34
"You generation of vipers! How can you speak good, when you are evil? For the mouth speaks what the heart is full of. "When the time of fruit drew near, he sent his slaves to the vine-dressers seized to get his fruit.
Acts 20:30
and that from among your own number, men will arise, perverting the truth, to draw away the disciples after them.
1 Timothy 5:13
Moreover, they learn to be idle, wandering about from house to house, and are not only idlers, but gossips also, and busybodies, repeating things they ought not.
Titus 1:10-11
For there are many individuals who are unruly, empty talkers and deceivers, particularly those of the circumcision, whose mouths must be stopped;
James 1:21
So strip off all filthiness and superfluity of wickedness, and in meekness receive the implanted Word, which is able to save your souls.
James 3:6
And the tongue is a fire; it is a very world of iniquity among our members, defiling the whole body, and setting on fire the wheel of nature, and is itself set on fire by hell.