Exodus 4:1-5 KJV

1 And Moses answered and said, But, behold, they will not believe me, nor hearken unto my voice: for they will say, The Lord hath not appeared unto thee.

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

3 And 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.

4 And 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:

5 That 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.