Exodus Chapter 7 Verse 4But Pharaoh shall not hearken unto you, that I may lay my hand upon Egypt, and bring forth mine armies, [and] my people the children of Israel, out of the land of Egypt by great judgments.

And the sons of Korah; Assir, and Elkanah, and Abiasaph: these [are] the families of the Korhites.

And Eleazar Aaron's son took him [one] of the daughters of Putiel to wife; and she bare him Phinehas: these [are] the heads of the fathers of the Levites according to their families.

These [are] that Aaron and Moses, to whom the LORD said, Bring out the children of Israel from the land of Egypt according to their armies.

These [are] they which spake to Pharaoh king of Egypt, to bring out the children of Israel from Egypt: these [are] that Moses and Aaron.

And it came to pass on the day [when] the LORD spake unto Moses in the land of Egypt,

That the LORD spake unto Moses, saying, I [am] the LORD: speak thou unto Pharaoh king of Egypt all that I say unto thee.

And Moses said before the LORD, Behold, I [am] of uncircumcised lips, and how shall Pharaoh hearken unto me?

And the LORD said unto Moses, See, I have made thee a god to Pharaoh: and Aaron thy brother shall be thy prophet.

Thou shalt speak all that I command thee: and Aaron thy brother shall speak unto Pharaoh, that he send the children of Israel out of his land.

And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt.

And the Egyptians shall know that I [am] the LORD, when I stretch forth mine hand upon Egypt, and bring out the children of Israel from among them.

And Moses and Aaron did as the LORD commanded them, so did they.

And Moses [was] fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.

And the LORD spake unto Moses and unto Aaron, saying,

When Pharaoh shall speak unto you, saying, Shew a miracle for you: then thou shalt say unto Aaron, Take thy rod, and cast [it] before Pharaoh, [and] it shall become a serpent.

And Moses and Aaron went in unto 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.

Then Pharaoh also called the wise men and the sorcerers: now the magicians of Egypt, they also did in like manner with their enchantments.

For they cast down every man his rod, and they became serpents: but Aaron's rod swallowed up their rods.

And he hardened Pharaoh's heart, that he hearkened not unto them; as the LORD had said.

And the LORD said unto Moses, Pharaoh's heart [is] hardened, he refuseth to let the people go.

The Book of Exodus, Chapter 7, Verse 4