When the Pharisees and Sadducees came to John the Baptist for baptism, John said,
”You offspring of vipers! Who warned you to flee from the coming wrath? (Matthew 3:7 NET; cf. Luke 3:7)
Jesus used the same language of the Scribes and Pharisees.
You snakes, you offspring of vipers! How will you escape being condemned to hell? (Matthew 23:33 NET; cf. 12:34)
The photo below shows the Palestinian Viper (behind tough plastic!) at the the Hai Bar Animal and Nature Reserve, north of Eilat, Israel.
The sign at the Reserve gives some explanation about this poisonous viper.
A visit to Hai Bar is a wonderful experience. The kids will love it, too.