Why do we fast on the 17th of Tammuz rather than the 9th of Tammuz, although the First Temple was breached on the 9th?
Synopsis
The fast was established on the 17th of Tammuz despite the First Temple breach on the 9th because the Second Temple was breached on the 17th, and the Second Temple's destruction is considered more severe, thus taking precedence in the halakhic designation.
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