Matthew 12:34
You brood of vipers! how can you speak good, when you are evil? For out of the abundance of the heart the mouth speaks.
Acts 20:30
and from among your own selves will arise men speaking perverse things, to draw away the disciples after them.
1 Timothy 5:13
Besides, they learn to be idle, going about from house to house. And not only do they become idlers, but also gossips and busybodies, saying things they ought not to.
Titus 1:10-11
For there are many rebellious men, empty talkers and deceivers, especially those of the circumcision.
James 1:21
Therefore, putting aside all filthiness and rank growth of wickedness, in humility receive the implanted word, which is able to save your souls.
James 3:6
And the tongue is a fire, a world of evil among the members of the body. The tongue corrupts our whole person, sets the whole course of our life on fire, and is itself set on fire by hell.