The association of our departure from Egypt and the prohibition against eating chametz, leaven, for seven/eight days, requires some explanation. Furthermore, the fact that a mitzvah d’Oraisa, Biblical commandment, obligates us to eat matzah (on the first night) begs elucidation in its relationship to the Exodus. The fact that we were compelled to rush out of Egypt, which precluded our ability to make leavened bread, is the obvious and accepted reason for eating matzah (for its commemorative value). Is there a deeper reason for negating leaven and replacing it with matzah? Horav Moshe Shapiro, zl, explains that when one mixes…