Exodus 7:19

And the Lord spake unto Moses, Say unto Aaron, Take thy rod, the same staff which had served before, and stretch out thine hand upon the waters of Egypt, upon their streams, upon their rivers, and upon their ponds, and upon all their pools of water, that they may become blood. Thus not only the Nile with its various arms was involved, but also the canals of the Nile, all lakes or ponds that had been formed by the overflow of the Nile, And that there may be blood throughout all the land of Egypt, both in vessels of wood and in vessels of stone, in all pails, jugs, and tubs, in which water was kept for use in the homes.