Exodus 7:1-3

American Standard Version

7 And Jehovah said unto Moses, See, I have made thee as God to Pharaoh; and Aaron thy brother shall be thy prophet. ² Thou shalt speak all that I command thee; and Aaron thy brother shall speak unto Pharaoh, that he let the children of Israel go out of his land. ³ And I will harden Pharaoh’s heart, and multiply my signs and my wonders in the land of Egypt.