'Viper' in the Bible

Dan will be a snake on the path, a viper on the road that snaps at the heels of horses, causing their riders to fall off.

He will suck the poison of cobras; the fangs of a viper will slay him.

"Don't rejoice, all of you Philistines, that the rod that struck you is broken, because from the snake's root a viper will spring up, and its offspring will be a darting, poisonous serpent.