Exodus 7:2 in the King James Version
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.
Context
1 The LORD said to Moses, “Behold, I have made you as God to Pharaoh; and Aaron your brother shall be your prophet.
2 You shall speak all that I command you; and Aaron your brother shall speak to Pharaoh, that he let the children of Israel go out of his land.
3 I will harden Pharaoh’s heart, and multiply my signs and my wonders in the land of Egypt.