What does it take to get the message? This parsha begins the wonders that Hashem sent to the autocrat Pharaoh that he should let the Hebrews free. The Midrash talks about that first plague of blood and that it wasn’t just in the Nile but is oozed from the walls and pillars of Pharaoh’s palace. Would he listen? He didn’t. How much do we have to be reminded of what is right before we do it.