Exodus 4:2-4

Then the LORD asked him, “What is that in your hand?” “A shepherd’s staff,” Moses replied. “Throw it down on the ground,” the LORD told him. So Moses threw down the staff, and it turned into a snake! Moses jumped back. Then the LORD told him, “Reach out and grab its tail.” So Moses reached out and grabbed it, and it turned back into a shepherd’s staff in his hand.