'Poison' in the Bible

“Lethal poison has been poured into him,and he won’t rise again from where he lies!”

Their poison is like the poison of a serpent: they are like the deaf adder that stoppeth her ear;

They put poison in my food, in my thirst they forced me to drink vinegar.

They have sharpened their tongues like a serpent; adders' poison is under their lips. Selah.