Matthew 12:34
Generation of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.
Acts 20:30
and men will arise from among yourselves, speaking perverse things, that they may draw off disciples after them.
1 Timothy 5:13
At the same time, also, they learn to be idle, wandering about from house to house; and not only idle, but tattlers also, and busybodies, speaking things which are not proper.
Titus 1:10-11
For there are many unruly and vain talkers and deceivers, especially those of the circumcision,
James 1:21
Wherefore, laying aside all filthiness, and every excess caused by malice, receive with meekness the ingrafted word, which is able to save your souls.
James 3:6
And the tongue is a fire, the world of iniquity. So is the tongue placed among our members, defiling the whole body, setting on fire the course of life, and being set on fire by hell.