Exodus 7:14-25

Then the LORD said to Moses, “The king is very stubborn and refuses to let the people go. So go and meet him in the morning when he goes down to the Nile. Take with you the walking stick that was turned into a snake, and wait for him on the riverbank. Then say to the king, ‘The LORD, the God of the Hebrews, sent me to tell you to let his people go, so that they can worship him in the desert. But until now you have not listened. Now, Your Majesty, the LORD says that you will find out who he is by what he is going to do. Look, I am going to strike the surface of the river with this stick, and the water will be turned into blood. The fish will die, and the river will stink so much that the Egyptians will not be able to drink from it.’” The LORD said to Moses, “Tell Aaron to take his stick and hold it out over all the rivers, canals, and pools in Egypt. The water will become blood, and all over the land there will be blood, even in the wooden tubs and stone jars.” Then Moses and Aaron did as the LORD commanded. In the presence of the king and his officers, Aaron raised his stick and struck the surface of the river, and all the water in it was turned into blood. The fish in the river died, and it smelled so bad that the Egyptians could not drink from it. There was blood everywhere in Egypt. Then the king's magicians did the same thing by means of their magic, and the king was as stubborn as ever. Just as the LORD had said, the king refused to listen to Moses and Aaron. Instead, he turned and went back to his palace without paying any attention even to this. All the Egyptians dug along the bank of the river for drinking water, because they were not able to drink water from the river. Seven days passed after the LORD struck the river.