Exodus 4:5

3He said, “Throw it on the ground.” He threw it on the ground, and it became a snake; and Moses ran away from it.

4The LORD said to Moses, “Stretch out your hand, and take it by the tail.” He stretched out his hand, and took hold of it, and it became a rod in his hand.

5“This is so that they may believe that the LORD, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has appeared to you.”

6The LORD said furthermore to him, “Now put your hand inside your cloak.” He put his hand inside his cloak, and when he took it out, behold, his hand was leprous, as white as snow.

7He said, “Put your hand inside your cloak again.” He put his hand inside his cloak again, and when he took it out of his cloak, behold, it had turned again as his other flesh.