'Serpent's' in the Bible

They sharpen their tongues like a serpent’s;Poison of a viper is under their lips. Selah.

“Do not rejoice, O Philistia, any of you,Because the rod [of Judah] that struck you is broken;For out of the serpent’s root will come a viper [King Hezekiah of Judah],And its offspring will be a flying serpent.

The wolf and the lamb will graze together, and the lion will eat straw like the ox [there will no longer be predator and prey]; and dust will be the serpent’s food. They will do no evil or harm in all My holy mountain (Zion),” says the Lord.