Exodus 7:1-3

Darby Translation

7 And Jehovah said to Moses, See, I have made thee 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 render Pharaoh's heart obdurate, and multiply my signs and my wonders in the land of Egypt.