The Alter Rebbe's shitah on the 12 seifim that codify the strict conditions for entrusting a letter, parcel, or item to a non-Jew who will carry it on Shabbos — with direct application to the postal and delivery services of our day.
LEVEL 01
Pedagogical introduction to the six seifim of the Mechaber: Hebrew text, clear English rendering, three key concepts (ketzitzah, ada'ata de-nafshei, keviyus bei doar), and five modern case studies (postal services, Amazon, courier delivery).
📖 StudyLEVEL 02
In-depth pilpul: the sugya in Shabbos 19, the machlokes Rashi–Rambam–Rosh on the interpretation of the baraisa, three readings of ketzitzah, the foundational חקירה on ada'ata de-nafshei, and practical נפקא מינות.
📖 StudyLEVEL 03
Structured synthesis: the axiom of ketzitzah, the K-A-K mnemonic (Ketzitzah · Ada'ata · Keviyus), decision tree, five pitfalls to avoid, Mechaber vs. Rema comparison table, and five practical guidelines.
📖 StudyLEVEL 04
The Shulchan Aruch HaRav on this siman: all 12 seifim complete and 2 entries of Kuntres Acharon. The strength and originality of the Alter Rebbe's psak, his own chiddush, sichos and igros of the Rebbe that illuminate the topic, and conduct למעשה.
📖 Study