G2191–ἔχιδνα–echidna

But when he saw many of the Pharisees and Sadducees coming for his baptism, he said to them, "You offspring of vipers, who warned you to flee from the wrath to come?

ἐχιδνῶν, echidnōn “of vipers,”

You offspring of vipers, how can you, being evil, speak good things? For out of the abundance of the heart, the mouth speaks.

ἐχιδνῶν, echidnōn “of vipers,”

You serpents, you offspring of vipers, how will you escape the judgment of Gehenna?

ἐχιδνῶν, echidnōn “of vipers!”

He said therefore to the multitudes who went out to be baptized by him, "You offspring of vipers, who warned you to flee from the wrath to come?

ἐχιδνῶν, echidnōn “of vipers,”

But when Paul had gathered a bundle of sticks and laid them on the fire, a viper came out because of the heat, and fastened on his hand.

ἔχιδνα echidna “a viper”