Exodus 7:5-15

5 And the Egyptians shall know that I [am] the LORD, when I stretch forth my hand upon Egypt, and bring out the children 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 and three years old, when they spoke to Pharaoh.
8 And the LORD spoke to Moses, and to Aaron, saying,
9 When Pharaoh shall speak to you, saying, Show a miracle for you: then thou shalt say to Aaron, Take thy rod, and cast [it] before Pharaoh, [and] it shall become a serpent.
10 And Moses and Aaron went in to Pharaoh, and they did so as the LORD had commanded: And Aaron cast down his rod before Pharaoh, and before his servants, and it became a serpent.
11 Then Pharaoh also called the wise-men, and the sorcerers: now the magicians of Egypt, they also did in like manner with their enchantments.
12 For they cast down every man his rod, and they became serpents: but Aaron's rod swallowed up their rods.
13 And he hardened Pharaoh's heart that he hearkened not to them; as the LORD had said.
14 And the LORD said to Moses, Pharaoh's heart [is] hardened; he refuseth to let the people go.
15 Go to Pharaoh in the morning; lo, he goeth out to the water, and thou shalt stand by the river's brink against he cometh; and the rod which was turned to a serpent shalt thou take in thy hand.
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