Now the redemption of Israel was a settled fact. But before Moses and Aaron could start on the work of delivering their people, God called various points to their attention, which He bade them consider in their undertaking. He spake to them, saying: "My children are perverse, passionate, and troublesome. You must be prepared to stand their abuse, to the length of being pelted with stones by them. I send you to Pharaoh, and although I will punish him according to his deserts, yet you must not fail in the respect due to him as a ruler. Furthermore, be careful to take the elders of the people into your counsel, and let your first step toward redemption be to make the people give up the worship of idols."
God Gave Moses and Aaron Hard Truths Before Confronting Pharaoh
Legends of the Jews 4:259