Exodus 7:1-10

1 The LORD said unto Moses, See, I have constituted thee as god unto Pharaoh; and Aaron, thy brother, shall be thy prophet.
2 Thou shalt speak all that I shall command thee; and Aaron, thy brother, shall speak unto Pharaoh that he send the sons of Israel out of his land.
3 And I will harden Pharaoh’s heart and multiply my signs and my wonders in the land of Egypt.
4 And Pharaoh shall not hearken unto you, but I shall lay my hand upon Egypt and bring forth my hosts, and my people, the sons of Israel, out of the land of Egypt by great judgments.
5 And the Egyptians shall know that I am the LORD when I stretch forth my hand upon Egypt and bring out the sons of Israel from among them.
6 And Moses and Aaron did as the LORD commanded them, so did they.
7 And Moses was eighty years old and Aaron eighty-three years old when they spoke unto Pharaoh.
8 And the LORD spoke unto Moses and unto Aaron, saying,
9 If Pharaoh shall answer you, saying, Show a miracle, then thou shalt say unto Aaron, Take thy rod and cast it before Pharaoh, that it shall become a dragon.
10 So Moses and Aaron went in unto Pharaoh, and they did as the LORD had commanded; and Aaron cast down his rod before Pharaoh and before his slaves, and it became a dragon.