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Rabbi Yosef Yitzchak Schneersohn (1880–1950), also known as the Frierdiker Rebbe, was the sixth Rebbe of Chabad-Lubavitch. He was a central figure in the preservation and dissemination of Torah and Chassidic teachings during times of great upheaval, and served as the father-in-law and predecessor of Rabbi Menachem Mendel Schneerson, the Lubavitcher Rebbe.
The letters exchanged between Rabbi Menachem Mendel Schneerson and his father-in-law, Rabbi Yosef Yitzchak Schneersohn, reveal a relationship rooted in deep Torah scholarship and mutual respect. In these letters, Rabbi Schneerson addresses his father-in-law with great reverence, referring to him as "the Rebbe shlita" and seeking his guidance and insight on complex halachic matters.
One notable topic discussed is the halachic prohibition of shaving the beard, particularly the nuances of whether the use of scissors (even those not resembling a razor) is forbidden by Torah law, or only by rabbinic decree. Rabbi Schneerson analyzes the responsa and novellae of the Tzemach Tzedek (the third Lubavitcher Rebbe), referencing various sources and expressing a desire for clarification on points of law and textual variants. He demonstrates humility and scholarly rigor, openly correcting a citation error from memory and emphasizing the importance of verifying sources, as seen in his follow-up letter regarding a passage in Midrash Tanchuma.
These letters illustrate the scholarly dialogue and meticulous approach to Torah learning that characterized the relationship between the Rebbe and his father-in-law, as well as the broader Chabad tradition of precise and respectful Torah correspondence.