Exodus 9:16

And, in very deed, for this cause have I raised thee up, God intended to set Pharaoh forth, as it were, as an example before the whole world and for all times, for to show in thee My power, and that My name be declared throughout all the earth. The manner in which the Lord would carry out the punishment upon Pharaoh would reveal His almighty power and cause His name to be extolled throughout the earth. After this general, impressive threat the Lord turns to the specific case in hand.