Chasidut к Миха 7:15

Hanukkah and Purim are illuminations deriving from the three Biblical holidays. Only the three holidays explicitly mentioned in the Torah are considered “Written Torah.” Corresponding to them are the holidays are of the “Oral Torah.” These are lights that are received similarly to how the light of the moon derives from the light of the sun, as everyone knows. Thus, by virtue of the Jewish people accepting the holidays properly, each holiday leaves an impression on the congregation of Israel. And by virtue of this, [the Jewish people] established other, corresponding holidays. Hanukkah derives from the holiday of Sukkot, and Purim derives from the holiday of Shavuot. We hope that there will yet be another deriving from the holiday of Passover, as it says, “I will show him wondrous deeds As in the days when You sallied forth from the land of Egypt” (Micah 7:15).