Matthew 3:7

But when he saw many of the Pharisees and Sadducees coming for baptism, he exclaimed, "O vipers' brood, who has warned you to flee from the coming wrath?

Matthew 23:33

O serpents, O vipers' brood, how are you to escape condemnation to Gehenna?

Romans 3:13

"Their throats resemble an opened grave; with their tongues they have been talking deceitfully." "The venom of vipers lies hidden behind their lips."

James 3:8

But the tongue no man or woman is able to tame. It is an ever-busy mischief, and is full of deadly poison.

Treasury of Scripture Knowledge

Summary

Their poison is like the poison of a serpent: they are like the deaf adder that stoppeth her ear;

Bible References

Poison

Romans 3:13
"Their throats resemble an opened grave; with their tongues they have been talking deceitfully." "The venom of vipers lies hidden behind their lips."
James 3:8
But the tongue no man or woman is able to tame. It is an ever-busy mischief, and is full of deadly poison.