Exodus 7:8-10

Amplified Bible, Classic Edition

⁸ And the Lord said to Moses and Aaron,

⁹ When Pharaoh says to you, Prove [your authority] by a miracle, then tell Aaron, Throw your rod down before Pharaoh, that it may become a serpent.

¹⁰ So Moses and Aaron went to Pharaoh and did as the Lord had commanded; Aaron threw down his rod before Pharaoh and his servants, and it became a serpent.