7. And Moses was eighty years old and Aaron eighty-three years old when they spoke to Pharaoh.
8. Then the Lord spoke to Moses and Aaron, saying,
9. “When Pharaoh speaks to you, saying, ‘Show a miracle for yourselves,’ then you shall say to Aaron, ‘Take your rod and cast it before Pharaoh, and let it become a serpent.’ ”
10. So Moses and Aaron went in to Pharaoh, and they did so, just as the Lord commanded. And Aaron cast down his rod before Pharaoh and before his servants, and it became a serpent.
11. But Pharaoh also called the wise men and the sorcerers; so the magicians of Egypt, they also did in like manner with their enchantments.
12. For every man threw down his rod, and they became serpents. But Aaron’s rod swallowed up their rods.
13. And Pharaoh’s heart grew hard, and he did not heed them, as the Lord had said.
14. So the Lord said to Moses: “Pharaoh’s heart is hard; he refuses to let the people go.
15. Go to Pharaoh in the morning, when he goes out to the water, and you shall stand by the river’s bank to meet him; and the rod which was turned to a serpent you shall take in your hand.
16. And you shall say to him, ‘The Lord God of the Hebrews has sent me to you, saying, “Let My people go, that they may serve Me in the wilderness”; but indeed, until now you would not hear!
17. Thus says the Lord: “By this you shall know that I am the Lord. Behold, I will strike the waters which are in the river with the rod that is in my hand, and they shall be turned to blood.
18. And the fish that are in the river shall die, the river shall stink, and the Egyptians will loathe to drink the water of the river.” ’ ”
19. Then the Lord spoke to Moses, “Say to Aaron, ‘Take your rod and stretch out your hand over the waters of Egypt, over their streams, over their rivers, over their ponds, and over all their pools of water, that they may become blood. And there shall be blood throughout all the land of Egypt, both in buckets of wood and pitchers of stone.’ ”