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,[167] and let your first step toward redemption be to make the people give up the worship of idols." The last was a most difficult task, and the words of God concerning it wrung the exclamation from Moses: "See, the children of Israel will not hearken unto me. How, then, should Pharaoh hearken unto me?"[168] It was the third time Moses declined to go on the errand of God. Now the Divine patience was exhausted, and Moses was subjected to punishment. At first God had revealed Himself only to Moses, and the original intention had been that he alone was to perform all the miracles, but henceforth the word of God was addressed to Aaron as well, and he was given a share in doing the wonders.[169] MEASURE FOR MEASURE God divided the ten punishments decreed for Egypt into four parts, three of the plagues He committed to Aaron, three to Moses, one to the two brothers together, and three He reserved for Himself. Aaron was charged with those, that proceeded from the earth and the water, the elements that are composed of more or less solid parts, from which are fashioned all the corporeal, distinctive entities, while the three entrusted to Moses were those that proceeded from the air and the fire, the elements that are most prolific of life.[170]