8And the LORD said to Moses and to Aaron, 9“When Pharaoh says to you, ‘Show us a miracle’, then you shall say to Aaron, ‘Take your rod, and cast it before Pharaoh, and it shall become a serpent’”. 10And Moses and Aaron went in to Pharaoh, and they did as the LORD had commanded: and Aaron cast down his rod before Pharaoh, and before his servants, and it became a serpent. 11Then Pharaoh also called the wise men and the sorcerers. Now the magicians of Egypt, they also did in like manner with their enchantments. 12For they cast down every man his rod, and they became serpents; but Aaron's rod swallowed up their rods. 13And He hardened Pharaoh's heart, that he hearkened not to them; as the LORD had said.

14And the LORD said to Moses, “Pharaoh's heart is hardened, he refuses to let the people go. 15Go to Pharaoh in the morning, as he goes out to the river; and you shall stand by the river's brink to meet him; and you shall take the rod which was turned to a serpent in your hand. 16And you shall say to him, “The LORD God of the Hebrews has sent me to you to say, ‘Let My people go, that they may serve Me in the wilderness’; until now you would not hear. 17Thus says the LORD, ‘In this you shall know that I am the LORD: behold, I will strike the water of the river with the rod in my hand upon, and it shall be turned to blood. 18And the fish that are in the river shall die, and the river shall stink; and the Egyptians shall loathe to drink of the water of the river’”. 19And the LORD spoke to Moses, “Say to Aaron, ‘Take your rod, and stretch out your hand upon the waters of Egypt, upon their streams, their rivers, their ponds, and all their pools of water, that they may become blood; and that there may be blood throughout all the land of Egypt, both in vessels of wood, and in vessels of stone’”. 20And Moses and Aaron did so, as the LORD commanded; and he raised the rod, and struck the waters that were in the river, within the sight of Pharaoh, and his servants; and all the waters that were in the river were turned to blood. 21And the fish that were in the river died; and the river stank, and the Egyptians could not drink of the water of the river; and there was blood throughout all the land of Egypt. 22And the magicians of Egypt did so with their enchantments: and Pharaoh's heart was hardened, neither did he listen to them; as the LORD had said. 23And Pharaoh turned and went into his house, nor did he take this to heart. 24And all the Egyptians dug around the river looking for water to drink; because they could not drink the water of the river. 25And seven days passed, after that the LORD had smitten the river.