שבעה עשר בתמוז – Shiv’ah Asar b’Tammuz, the seventeenth day of Tammuz (תמוז), the fourth month of the Ecclesiastical calendar and the tenth month of the civil calendar. The fast on this day commemorates the siege of Jerusalem during which the walls to the city were breached, leading to the destruction of the Second Temple. It is the beginning of a period of mourning, which culminates in the fast of the 9th of Av.
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