Aaron the first High Priest, brother of Moses and Miriam, passed away at age 123 on the 1st of Av of the year 2487 from creation (1274 BCE). This is the only yahrzeit (date of passing) explicitly mentioned in the Torah (Numbers 33:38).
Links:
A Midrashic description
of Aaron's passing
More about Aaron
"Aaron" and "On the Essence of Circumstance" -- a spiritual profile based on the Lubavitcher Rebbe's talks
Following their long journey from Babylon (see Jewish history for the 12th of Nissan), Ezra and his entourage arrived in the land of Israel to be near the newly built second Holy Temple in Jerusalem. A relatively small group came together with Ezra, the majority of Jews, including great Torah scholars, choosing to remain in Babylon due to the harsh conditions that were then prevailing in Israel.
Link: Ezra the Scribe
Today is Rosh Chodesh--"Head of the Month"--for the Hebrew month of "Av" (also called "Menachem Av").
Special portions are added to the daily prayers: Hallel (Psalms 113-118) is recited -- in its "partial" form -- following the Shacharit morning prayer, and the Yaaleh V'yavo prayer is added to the Amidah and to Grace After Meals; the additional Musaf prayer is said (when Rosh Chodesh is Shabbat, special additions are made to the Shabbat Musaf). Tachnun (confession of sins) and similar prayers are omitted.
Many have the custom to mark Rosh Chodesh with a festive meal and reduced work activity. The latter custom is prevalent amongst women, who have a special affinity with Rosh Chodesh -- the month being the feminine aspect of the Jewish Calendar.
Links: The 29th Day; The Lunar Files
"When Av begins, we diminish [our] rejoicing" (Talmud, Taanit 26b).
On the 1st of Av, "The Three Weeks" mourning period over the destruction of the Holy Temple--which began 13 days earlier on Tammuz 17--enters an intensified stage. During "The Nine Days" from Av 1st to the Ninth of Av, a heightened degree of mourning is observed, including abstention from meat and wine, music, bathing for pleasure, and other joyous and enjoyable activities. (The particular mourning customs vary from community to community, so consult a competent Halachic authority for details).
Consumption of meat and wine is permitted on Shabbat, or at a Seudat Mitzvah (obligatory festive meal celebrating the fulfillment of a mitzvah) such as a Bris (circumcision), or a "Siyum" celebrating the completion of a course of Torah study (i.e., a complete Talmudic tractate). The Lubavitcher Rebbe initiated the custom of conducting or participating in a Siyum on each of the Nine Days (even if one does not avail oneself of the dispensation to eat meat).
Citing the verse (Isaiah 1:27) "Zion shall be redeemed with mishpat [Torah] and its returnees with Tzedakah," the Rebbe urged that we increase in Torah study (particularly the study of the laws of the Holy Temple) and charity during this period.
Of the 54 parshiot of the Five Books of Moses, only one is named after a woman. It is called “The Life of Sarah.”
It opens by informing us that Sarah has died.
Yes, this is the life of Sarah. Her true life. Because only in her passing was Sarah’s life fulfilled.
During her lifetime, she and her husband Abraham surveyed the land promised to their children. Only once Sarah died did Abraham make his first actual purchase, publicly and with full payment. Sarah’s burial plot and its accompanying field in Hebron mark the seminal point of the Land of Israel.
During her lifetime, Sarah had only one child, who remained single. From where would come the “offspring more numerous than the stars” that G‑d had promised? With Sarah’s passing, the match between Isaac and Rebecca was made, a woman much like Sarah, through whom the Jewish people would become a reality.
During Sarah’s lifetime, Abraham was not able to guide Ishmael. By divine command, he was compelled to harken to Sarah, who witnessed Ishmael’s corruptive influence and demanded he be sent away. By the end of the parashah, Abraham is following in the ways of Sarah with the rest of his children. Even Ishmael has repented and accepted Isaac as the true heir of Abraham.
It was after Sarah’s passing that Abraham’s vision began to emerge into reality in this world—through the work of Sarah.
This is true life—a life not confined to the years of a physical body, but a life that becomes yet more real after it is released from those confines, and continues to be felt more and more with every year that passes.
Such is the life of a mother. While the rest of us live within a moment that has already disappeared, a mother gives life, nurtures life, and guides that life into eternity.

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