Exodus 4:3-5

Young's Literal Translation

³ and He saith, `Cast it to the earth;' and he casteth it to the earth, and it becometh a serpent -- and Moses fleeth from its presence.

⁴ And Jehovah saith unto Moses, `Put forth thy hand, and lay hold on the tail of it;' and he putteth forth his hand, and layeth hold on it, and it becometh a rod in his hand --

⁵ `-- so that they believe that Jehovah, God of their fathers, hath appeared unto thee, God of Abraham, God of Isaac, and God of Jacob.'