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Rabbi Yaakov Zaltz was a rabbinic figure residing in Tzfat (Safed), who corresponded with the Lubavitcher Rebbe, Rabbi Menachem Mendel Schneerson, on matters of Jewish law and communal life. His letters reflect a deep engagement with halachic issues and communal activities, particularly those connected to Chabad institutions.
The correspondence between Rabbi Zaltz and the Rebbe, as evidenced in the letters from 5715 (1954–1955), centers on practical halachic questions and reports of communal developments. In one letter, Rabbi Zaltz informs the Rebbe of the successful establishment of a minyan in the Chabad Beis Midrash during the Ten Days of Repentance, noting its dual function as both a synagogue and a study hall. The Rebbe responds with gratitude and highlights the significance of such an institution, referencing the teaching of Chazal on the verse "Ohev Hashem Sha'arei Tzion Mikol Mishkenot Yaakov" (Berachos 8a), emphasizing the value of places dedicated to Torah and prayer.
Another significant theme in their correspondence is halachic inquiry. Rabbi Zaltz sought the Rebbe's guidance regarding the kashrus of etrogim (citrons) lacking certain physical features, such as a pitum or groove, and whether such etrogim are preferable to grafted ones. The Rebbe addresses this by referencing responsa from the Chatam Sofer and clarifies the role of tradition and physical signs in determining the suitability of an etrog for the mitzvah.
Further, Rabbi Zaltz raised questions about the proper time for lighting Chanukah candles, especially on Erev Shabbos, and the permissibility of using electric lights for the mitzvah. The Rebbe responds in detail, citing various halachic authorities and responsa, and addresses practical concerns about the duration of the light and the possibility of interruption, ultimately disagreeing with the reasoning that would invalidate electric lights due to the potential for someone to turn them off.
The tone of the correspondence is respectful and scholarly, with the Rebbe offering detailed halachic analysis and personal blessings. The Rebbe also assures Rabbi Zaltz that he will mention him and his family at the resting place of his father-in-law, the previous Rebbe, indicating a relationship that combined personal care with rabbinic mentorship. The letters reflect the Rebbe's encouragement of communal Torah life and his willingness to engage deeply with practical halachic questions from rabbinic leaders in the Land of Israel.