Matthew 12:34
You brood of vipers! how can you, evil as you are, say anything good? For what fills the heart will rise to the lips.
Romans 3:13-14
'Their throats are like opened graves; they deceive with their tongues.' 'The venom of serpents lies behind their lips,'
2 Corinthians 11:3
Yet I fear that it may turn out that, just as the Serpent by his craftiness deceived Eve, so your minds may have lost the loyalty and purity due from you to the Christ.
James 3:6-8
And the tongue is like a spark. Among the members of our body it proves itself a very world of mischief; it contaminates the whole body; it sets the wheels of life on fire, and is itself set on fire by the flames of the Pit.