Their poison is like the poison of a serpent: they are like the deaf adder which stoppeth her ear; Which doth not hearken to the voice of enchanters, of one charming ever so wisely.

If the serpent bite before enchantment, then the charmer hath no advantage.

For behold, I send among you serpents, vipers against which there is no charm, and they shall bite you, saith Jehovah.