First printing of the Zohar, the fundamental work of the Kabbalah (Jewish esoteric and mystical teachings), authored by the Talmudic sage, Rabbi Shimon Bar Yochai.
Links: The Kabbalah
Av 20 is the anniversary of the passing of the Lubavitcher Rebbe's father, Rabbi Levi Yitzchak Schneerson (1878-1944), in Alma Ata (currently Almaty), Kazakhstan. Rabbi Levi Yitzchak was Chief Rabbi of Yekaterinoslav (currently Dnipro), Ukraine, and was arrested and exiled to Kazakhstan by the Stalinist regime as a result of his work to preserve Jewish life in the Soviet Union.
Links:
A Brief Biography
Rebbetzin Chana Scneerson's biography, which includes her account of her husband's heroism, arrest and passing.
Yom Kippur is a day of forgiveness for those who return.
But then, every day is a day of forgiveness for those who return.
Yet Yom Kippur is an entirely different story.
Because on any other day when a soul returns, her misdeeds are discarded.
On Yom Kippur, when a soul returns, she is held in tight embrace.
Within the fire of that embrace, there never were any misdeeds. There is only oneness, peace, and eternal love.