Exodus 4 - 6

God proves to a doubting Moses that he is the one chosen to lead Israel out of Egypt.  Moses travels to Egypt and speaks to the Israelites and then to Pharaoh.  While the people are reluctant to trust Moses, Pharaoh is set against his labor force leaving and makes their tasks even harder to perform.  God promises Moses that He will deliver His people from their bondage and appoints Moses' brother, Aaron, as his spokesman.