Exodus 7:19

19So the Lord said to Moses, “Tell Aaron: Take your staff and stretch out your hand a over the waters of Egypt – over their rivers, canals,
The Hb word refers specifically to the various branches and canals of the Nile River; Ex 8:5.
ponds, and all their water reservoirs – and they will become blood. There will be blood throughout the land of Egypt, even in wooden and stone containers.”

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