Thou shalt eat no leavened bread with it; seven days shalt thou eat unleavened bread therewith, even the bread of affliction; for thou camest forth out of the land of Egypt in haste: that thou mayest remember the day when thou camest forth out of the land of Egypt all the days of thy life.
You shall not eat yeast bread with it; for seven days, you must eat unleavened bread, the bread of suffering. This is because you left Egypt in a hurry. Doing this will help you remember the day you left Egypt for your entire life.