Who Knows Fifteen?
The last mishnah in Maseches Taanis says that the most joyous holidays of the Jewish calendar were Tu B’Av and Yom Kippur. Yom Kippur was understandably a holiday because it is the day that Hashem forgives Klal Yisrael…
Jewish History
The decree that the generation of the spies would die in the wilderness, and the yearly Tishah B'Av deaths that ended on Tu B'Av.
The last mishnah in Maseches Taanis says that the most joyous holidays of the Jewish calendar were Tu B’Av and Yom Kippur. Yom Kippur was understandably a holiday because it is the day that Hashem forgives Klal Yisrael…