In Exodus chapters 4-6, Moses expresses doubts about his ability to convince the Israelites and confront Pharaoh. God provides him with signs, including turning a rod into a serpent and making Moses' hand leprous temporarily, as evidence of divine backing. Yet, Moses remains hesitant due to his speech impediment. God assigns Aaron, Moses' brother, as his spokesperson. Upon returning to Egypt, Moses and Aaron gather the elders, demonstrating the signs and receiving their support. When they appeal to Pharaoh to release the Israelites for a festival of worship, Pharaoh not only refuses but also increases the Israelites' workload, causing them to resent Moses and Aaron. Distraught, Moses questions God's plan, but God reaffirms His promise to liberate the Israelites.