KJV: But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?
NASB: But when he saw many of the Pharisees and Sadducees coming for baptism, he said to them, "You brood of vipers, who warned you to flee from the wrath to come?