Exodus 4:3
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.
Torrey's Topical Textbook—AKJV

Exodus 7:9,15
When Pharaoh shall speak to you, saying, Show a miracle for you: then you shall say to Aaron, Take your rod, and cast it before Pharaoh, and it shall become a serpent.
Torrey's Topical Textbook—AKJV