Zakhor

Paradoxically, the Torah requires Jews to remember Amalek's attack on them as they left slavery in Egypt even as they are required simultaneously to "blot out the memory of Amalek." This mitzvah is typically fulfilled by ensuring that one hears the special liturgical reading of the verses in Deuteronomy that contain this commandment on the Shabbat before the holiday of Purim, which celebrates the Jewish triumph over the wicked Amalekite Haman.