Exodus 4:4

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.

⁶  And the LORD said furthermore unto him, Put now thine hand into thy bosom. And he put his hand into his bosom: and when he took it out, behold, his hand was leprous as snow.