The Three Weeks or Bein ha-Metzarim (Hebrew: בין המצרים, "Between the ") (cf "") is a period of mourning commemorating the destruction of the first and second Jewish Temples. The Three Weeks start on the seventeenth day of the Jewish month of Tammuz — the fast of Shiva Asar B'Tammuz — and end on the ninth day of the Jewish month of Av — the fast of Tisha B'Av, which occurs exactly three weeks later. Both of these fasts commemorate events surrounding the destruction of the Jewish Temples and the subsequent exile of the Jews from the land of Israel. According to conventional chronology, the destruction of the first Temple, by Nebuchadnezzar II, occurred in 586 BCE, and the second, by the Romans, in 70 CE. Jewish chronology, however, traditionally places the first destruction at about 421 BCE. (See Missing years (Hebrew calendar) for more information.)
The mourning observances during the Three Weeks are divided into four levels, increasing in intensity:
Standard Ashkenazic custom, or minhag, restricts the extent to which one may take a haircut, shave or listen to music, though communities and individuals vary their levels of observance of these customs. No Jewish marriages or other major celebrations are allowed during the Three Weeks, since the joy of such an event would conflict with the expected mood of mourning during this time.
Many Orthodox Jews refrain from eating meat during the Nine Days from the first of the month of Av until midday of the day after the fast of Ninth of Av, based on the tradition that the Temple burned until that time.