Verses with the word adder in the Old Testament (4 verses):
Dan shall be a serpent by the way, an adder in the path, that biteth the horse heels, so that his rider shall fall backward.
Their poison is like the poison of a serpent: they are like the deaf adder that stoppeth her ear;
Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet.
At the last it biteth like a serpent, and stingeth like an adder.