Bible Verses About Serpents: Characterised as subtle

Now the serpent was more subtill then any beast of the fielde, which the Lord God had made: and he said to the woman, Yea, hath God in deede said, Ye shall not eate of euery tree of the garden?

Behold, I send you as sheepe in the middes of the wolues: be yee therefore wise as serpents, and innocent as doues.