Matthew 12:34
O ye generations of vipers, how are you, being evil, able to speak good things? for out of the abundance of the heart the mouth speaks.
Acts 20:30
and men from you yourselves will rise up, speaking perverse things, in order to lead away disciples after them.
1 Timothy 5:13
and at the same time they learn to be idle, going about houses; and not only idle, but also loquacious even busybodies, speaking things which they ought not.
Titus 1:10-11
For many are incorrigible, speaking vain things and egotistical, especially those from the circumcision,
James 1:21
Therefore having laid aside all filthiness and excess of evil, receive with meekness the engrafted word, which is able to save your souls.
James 3:6
The tongue, a fire, the world of iniquity: the tongue sits down in the midst of our members, and corrupting the whole body, and setting on fire the course of nature; and it is set on fire from hell.