The inspection for the presence and removal of leavened dough items, usually performed on the evening of 13th Nissan.
Why is matzah eaten on Passover, and chametz burned on the eve of Passover? What is the meaning of this main Passover commandment? Rabbi Schneur Zalman, the founder of Chabad, offers the following explanation. Chametz—leavened dough that rises and develops—represents the egotistical side of a person: arrogance, conceit, excessive demands, self-importance, and a disdainful attitude toward others. In contrast, matzah dough, made from flour and water without yeast, does not rise and represents modesty and unpretentiousness, sensitivity, and caring for others.
On the eve of Passover, every Jew should not limit themselves to searching for bread crumbs in dark corners of the apartment. It is also important to cleanse your soul of conceit and egoism, to impartially evaluate your attitude towards loved ones, to become better, kinder, more attentive and thereby accelerate the onset of redemption for the Jewish people and the entire world.