G2191–ἔχιδνα–echidna

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

ἐχιδνῶν, echidnōn “of vipers,”

Ye offspring of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

ἐχιδνῶν, echidnōn “of vipers,”

Ye serpents, ye offspring of vipers, how shall ye escape the judgment of hell?

ἐχιδνῶν, echidnōn “of vipers!”

He said therefore to the multitudes that went out to be baptized of him, Ye 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 by reason of the heat, and fastened on his hand.

ἔχιδνα echidna “a viper”