Tisha B'Av, the Fast of the Ninth [of the Hebrew month] of Av, will begin on Monday night, August 8th, before sundown and end the following night. The fast is the end of the "Three Weeks" period of mourning for the destruction of the two Holy Temples in Jerusalem. The Sabbath preceding the fast is called Shabbat "Chazon," after the first word of Isaiah I, the chapter read in the synagogue that morning to the mournful tune of Megillat Eicha, the elegy written by the prophet Jeremiah as he witnessed the First Temple's destruction.