In Exodus 4, Moses says "What if they do not believe me or listen to me and say, 'The Lord did not appear to you' ?" So Moses was again unsure of his ability to lead the Israelites, but God told Moses that He would show Himself to the people through Moses by wonderous signs and miracles. Then Moses said, "O Lord, I have never been eloquent, neither in the past nor since you have spoken to your servant. I am slow of speech and tongue." God responded, "Who gave man his mouth? ... Now go; I will help you speak and will teach you what to say." Moses begged, "please send someone else to do it". Though the Lord was angry at Moses, he sent Moses' brother, Aaron, also and said "I will help both of you speak and will teach you what to do". God then told Moses to return to Egypt, perform signs and miracles before Pharaoh that He will give power to do, and then say to Pharaoh, "Let my people go". God warned Moses that Pharaoh's heart will be hardened and he would not let the people go. God instructed Moses to tell Pharaoh that the consequence will be the death of his firstborn son, since he refused the request for His firstborn son, Israel, not allowing him to worship the Lord. Then Moses and Aaron brought together all the elders of the Israelites and told them everything the Lord had said to Moses and that the Lord was concerned about them and had seen their misery. Moses then performed for the Israelites all the signs and they believed and bowed down and worshiped the Lord.