Shalom.
Tisha B'Av is the saddest day on the Jewish calendar because
of the incredible series of tragedies which occurred on that
date throughout Jewish History.
Tisha B'Av means "the ninth of the Hebrew month of Av".
Tisha B'Av primarily commemorates the destruction of the first
and second Temples, both of which were destroyed on the ninth
of Av - the first by the Babylonians in 586 B.C.E.; the second
by the Romans in 70 C.E.
Although this day is primarily meant to commemorate the
destruction of the Temple, it is appropriate to consider on
this day the many other tragedies of the Jewish people, many
of which occurred on this day, most notably the expulsion of
the Jews from Spain in 1492.
This year 5781 - 2021 we observe the fast day of Tisha B'Av
starting from Saturday after nightfall, July 17,
until nightfall on Sunday July 18.
You can learn more about this Jewish fast day at:
https://jr.co.il/hotsites/tisha-b-av.htm
May we see the rebuilding of the Temple in our days and that
Tisha B'Av becomes a day of celebration.
If you are fasting:
Have a meaningful fast.
Jacob