Exodus 4:1-3

Young's Literal Translation

4 And Moses answereth and saith, `And, if they do not give credence to me, nor hearken to my voice, and say, Jehovah hath not appeared unto thee?'

² And Jehovah saith unto him, `What [is] this in thy hand?' and he saith, `A rod;'

³ and He saith, `Cast it to the earth;' and he casteth it to the earth, and it becometh a serpent -- and Moses fleeth from its presence.