'Vipers' in the Bible

And having seen many of the Pharisees and Sadducees coming about his baptism, he said to them, 'Brood of vipers! who did shew you to flee from the coming wrath?

Brood of vipers! how are ye able to speak good things -- being evil? for out of the abundance of the heart doth the mouth speak.

'Serpents! brood of vipers! how may ye escape from the judgment of the gehenna?

Then said he to the multitudes coming forth to be baptised by him, 'Brood of vipers! who did prompt you to flee from the coming wrath?