'Serpent' in the Bible

and the people come in unto Moses and say, 'We have sinned, for we have spoken against Jehovah, and against thee; pray unto Jehovah, and He doth turn aside from us the serpent;' and Moses prayeth in behalf of the people.

And Jehovah saith unto Moses, 'Make for thee a burning serpent, and set it on an ensign; and it hath been, every one who is bitten and hath seen it -- he hath lived.

And Moses maketh a serpent of brass, and setteth it on the ensign, and it hath been, if the serpent hath bitten any man, and he hath looked expectingly unto the serpent of brass -- he hath lived.