Exodus 7:4

²  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.

³  And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt.

⁴  But 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.

⁵  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.

⁶  And Moses and Aaron did as the LORD commanded them, so did they.