'Offspring' in the Bible

But [when he] saw many of the Pharisees and Sadducees coming to his baptism, he said to them, "Offspring of vipers! Who warned you to flee from the coming wrath?

Offspring of vipers! How are you able to say good things [when you] are evil? For from the abundance of the heart the mouth speaks.

Serpents! Offspring of vipers! How will you escape from the condemnation to hell?