Question: Why didn't the Israelites bake bread (the Torah says that they did not have time for the dough to rise)? They knew 14 days ahead of time (on Rosh Chodesh Nisan) that they would be leaving, and they knew it would be middle of night (since God said that is when they would leave).
Answer: The Israelites did not do anything to prepare, except what God told them to do: the Passover offering and putting blood on their doorposts.