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 yahrtzeit (anniversary of the passing) of the Lubavitcher Rebbe's father, Rabbi Levi Yitzchak Schneerson (1878-1944), in Alma Ata, Kazakhstan. Rabbi Levi Yitzchak was Chief Rabbi of Yekaterinoslav (currently Dnepropetrovsk), 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.
Mitzvah (mits-va): An instruction in life from the Giver of Life.
A stroke of brilliance arising from the innermost will of the Creator of all things, left for you to perform on the stage of His world.
A connection point in time, at which Heaven meets Earth, Earth meets Heaven, and the two embrace.
An instance, left in your hands, for the true reality to be exposed, as what would otherwise be a trivial object—a dollar bill, a candle, a braided loaf of bread, a black leather strap—is suddenly revealed as a divine instrument.
An opportunity to make the transient eternal in a moment—you, your body, and the artifacts of your world.