'Serpents' in the Bible

"Remember it is I who am sending you out, as sheep into the midst of wolves; prove yourselves as sagacious as serpents, and as innocent as doves.

O serpents, O vipers' brood, how are you to escape condemnation to Gehenna?

"I have given you power to tread serpents and scorpions underfoot, and to trample on all the power of the Enemy; and in no case shall anything do you harm.

And do not let us test the Lord too far, as some of them tested Him and were destroyed by the serpents.

For the power of the horses is in their mouths and in their tails; their tails being like serpents, and having heads, and it is with them that they inflict injury.