'Vipers' in the Bible

But when he saw many of the Pharisees and Sadducees coming for his baptism, he said to them, "You offspring of vipers, who warned you to flee from the wrath to come?

You offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.

You serpents, you offspring of vipers, how will you escape the judgment of Gehenna?

He said therefore to the multitudes who went out to be baptized by him, "You offspring of vipers, who warned you to flee from the wrath to come?

"Their throat is an open tomb. With their tongues they have used deceit." "The poison of vipers is under their lips;"