G2191–ἔχιδνα–echidna

And having seen many of the Pharisees and Sadducees coming about his baptism, he said to them, `Brood of vipers! who did shew you to flee from the coming wrath?

ἐχιδνῶν, echidnōn “of vipers,”

`Brood of vipers! how are ye able to speak good things -- being evil? for out of the abundance of the heart doth the mouth speak.

ἐχιδνῶν, echidnōn “of vipers,”

`Serpents! brood of vipers! how may ye escape from the judgment of the gehenna?

ἐχιδνῶν, echidnōn “of vipers!”

Then said he to the multitudes coming forth to be baptised by him, `Brood of vipers! who did prompt you to flee from the coming wrath?

ἐχιδνῶν, echidnōn “of vipers,”

but Paul having gathered together a quantity of sticks, and having laid `them' upon the fire, a viper -- out of the heat having come -- did fasten on his hand.

ἔχιδνα echidna “a viper”