Exodus 6:26-30

These are the same Aaron and Moses to whom the LORD said, “Bring out the children of Israel from the land of Egypt according to their armies.” These are the ones who spoke to Pharaoh king of Egypt, to bring out the children of Israel from Egypt. These are the same Moses and Aaron. And it came to pass, on the day the LORD spoke to Moses in the land of Egypt, that the LORD spoke to Moses, saying, “I am the LORD. Speak to Pharaoh king of Egypt all that I say to you.” But Moses said before the LORD, “Behold, I am of uncircumcised lips, and how shall Pharaoh heed me?”