'Serpent's' in the Bible

Don't rejoice, O Philistia, all of you, because the rod that struck you is broken; for out of the serpent's root an adder will emerge, and his fruit will be a fiery flying serpent.

The wolf and the lamb shall feed together, and the lion shall eat straw like the ox; and dust shall be the serpent's food. They shall not hurt nor destroy in all my holy mountain," says Yahweh.