Exodus 7:2 KJV
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.
Exodus 7:2, King James Version
In context
1 And the Lord said unto Moses, See, I have made thee a 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 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.