Exodus 4:2-5 (King James Version)

 ²And the LORD said unto him, What is that in thine hand? And he said, A rod.

 ³And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it.

 ⁴And the LORD said unto Moses, Put forth thine hand, and take it by the tail. And he put forth his hand, and caught it, and it became a rod in his hand:

 ⁵That they may believe that the LORD God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath appeared unto thee.