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How did Aaron and Moses demand that Pharaoh free the Israelites?

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Aaron Aaron, detail of a 3rd-century fresco from the synagogue at Doura-Europus, Syria; in the National Museum, Damascus

In the biblical narrative of the Book of Exodus, Moses and Aaron acted in concert to demand that the pharaoh release the Israelites from bondage. While Moses served as the primary leader and prophet, Aaron acted as his "mouth," directly telling the pharaoh to let the people go.1

To demonstrate the power of God and force the pharaoh's compliance, the brothers utilized miraculous signs. Aaron specifically used his magic rod to perform several of the Ten Plagues of Egypt, such as turning the Nile into blood and bringing forth frogs and gnats. Throughout these encounters, Moses repeatedly delivered the demand, "Let my people go!". Despite these divine acts, the pharaoh’s heart was repeatedly hardened, leading to a series of ten escalating plagues until the final event—the death of the firstborn—compelled him to finally grant the Israelites their freedom.12