Exodus 6:27-29

Young's Literal Translation

²⁷ these are they who are speaking unto Pharaoh king of Egypt, to bring out the sons of Israel from Egypt, this [is] Moses -- and Aaron.

²⁸ And it cometh to pass in the day of Jehovah's speaking unto Moses in the land of Egypt,

²⁹ that Jehovah speaketh unto Moses, saying, `I [am] Jehovah, speak unto Pharaoh king of Egypt all that I am speaking unto thee.'