Which of the Ten Plagues involved Aaron turning the Nile’s water into blood?

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Aaron Aaron, detail of a 3rd-century fresco from the synagogue at Doura-Europus, Syria; in the National Museum, Damascus

The act of turning the Nile’s water into blood was the first of the Ten Plagues of Egypt, as described in the Book of Exodus. In this narrative, Aaron—the brother of Moses—uses his miraculous staff to strike the water, causing it to become non-potable and killing the fish within it.1