Exodus 4:2-9

2And Jehovah said to him, What is that in thy hand? And he said, A staff.

3And 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.

4And Jehovah said to Moses, Stretch out thy hand and take it by the tail — and he stretched out his hand and caught it, and it became a staff in his hand —

5that they may believe that Jehovah, the 1God of their fathers, the 2God of Abraham, the 3God of Isaac, and the 4God of Jacob, hath appeared unto thee.

6And Jehovah said moreover to him, Put now thy hand into thy bosom. And he put his hand into his bosom, and took it out, and behold, his hand was leprous, as snow.

7And he said, Put thy hand into thy bosom again. And he put his hand into his bosom again, and took it out of his bosom, and behold, it was turned again as his flesh.

8And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the other sign.

9And it shall come to pass, if they will not believe also those two signs, neither hearken unto thy voice, that thou shalt take of the water of the river, and pour [it] on the dry [land]; and the water that thou takest out of the river shall become blood upon the dry [land].