Exodus 4
3 Ref And he said, Put it down on the earth. And he put it down on the earth and it became a snake; and Moses went running from it.
4 Ref And the Lord said to Moses, Put out your hand and take it by the tail: (and he put out his hand and took a grip of it and it became a rod in his hand:)
5 Ref So that they may be certain that the Lord, the God of their fathers, the God of Abraham, of Isaac, and of Jacob, has been seen by you.