The frogs died. —God, who knew the heart of Pharaoh, and its insincerity, or at any rate its fickleness, took the plague of frogs …

And they gathered them together upon heaps
Swept them up, and laid them in heaps out of the way:

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Pharaoh is plagued with frogs; their vast numbers made them severe plagues to the Egyptians. God could have plagued Egypt with lions, or bears, or …