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The first plague was blood. God instructed Aaron to strike the river Nile with his staff; all of its water turned into blood. As a result of the blood, the fish of the Nile died, filling Egypt with an awful stench. Other water resources used by the Egyptians were turned to blood as well (7:19). Pharaoh's sorcerers demonstrated that they too could turn water to blood, and Pharaoh therefore made no concession to Moses' demands. This plague lasted for seven days.