'Vipers' in the Bible

Indeed, I am about to send snakes among you,poisonous vipers that cannot be charmed.They will bite you.This is the Lord’s declaration.

When he saw many of the Pharisees and Sadducees coming to the place of his baptism, he said to them, “Brood of vipers! Who warned you to flee from the coming wrath?

Brood of vipers! How can you speak good things when you are evil? For the mouth speaks from the overflow of the heart.

“Snakes! Brood of vipers! How can you escape being condemned to hell?

He then said to the crowds who came out to be baptized by him, “Brood of vipers! Who warned you to flee from the coming wrath?

Their throat is an open grave;they deceive with their tongues.Vipers’ venom is under their lips.