Exodus 6:26-30

This was the Aaron and Moses to whom the LORD said, “Lead the people of Israel out of Egypt by their divisions.” Aaron and Moses are the ones who talked to the king of Egypt and told him to let the Israelites leave Egypt. The LORD spoke to Moses in the land of Egypt and said, “I am the LORD. Tell the king of Egypt everything I tell you.” But Moses answered, “I am not a good speaker. The king will not listen to me.”