"Then I will harden Pharaoh's heart, so that he will pursue them; and I will gain honor over Pharaoh and over all his army, that the Egyptians may know that I [am] the LORD." And they did so.

"And the Egyptians shall know that I [am] the LORD, when I stretch out My hand on Egypt and bring out the children of Israel from among them."

'Thus says the LORD: "By this you shall know that I [am] the LORD. Behold, I will strike the waters which [are] in the river with the rod that [is] in my hand, and they shall be turned to blood.