'Serpent's' in the Bible

Rejoice not thou, Philistia, all of thee, because the rod that smote thee is broken; for out of the serpent's root shall come forth a viper, and his fruit shall 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 meat. They shall not hurt nor destroy in all my holy mountain, saith Jehovah.

Her voice shall go like a serpent's; for they shall march with an army, and come against her with axes, as hewers of wood.