1 Peter 3:15
but reverence Christ as Lord in your own hearts. Always be ready with a reply for anyone who calls you to account for the hope you cherish, but answer gently and with a sense of reverence;
Matthew 12:34
You brood of vipers, how can you speak good when you are evil? For the mouth utters what the heart is full of.
Titus 1:10-11
For there are plenty of insubordinate creatures who impose on people with their empty arguments, particularly those who have come over from Judaism;
James 3:6-8
And the tongue is a fire, the tongue proves a very world of mischief among our members, staining the whole of the body and setting fire to the round circle of existence with a flame fed by hell.
2 Peter 2:18
By talking arrogant futilities they beguile with the sensual lure of fleshly passion those who are just escaping from the company of misconduct ??19 promising them freedom, when they are themselves enslaved to corruption (for a man is the slave of whatever overpowers him).