Fast of Tenth of Tevet.

On the 10th day of the Jewish month of Tevet, in the year 3336 from Creation (425 BCE), the armies of the Babylonian emperor Nebuchadnezzar laid siege to Jerusalem. Thirty months later—on 9 Tammuz 3338—the city walls were breached, and on 9th of Av of that year the Holy Temple was destroyed. The Jewish people were exiled to Babylonia for 70 years. The 10th of Tevet is observed as a day of fasting, mourning and repentance. We refrain from food and drink and add selichot and other special supplements to our prayers. The fast begins at daybreak and ends at nightfall. Recite the Friday night Kiddush, and then break your fast.