Pesach - Heseibah: Condition or Separate Mitzvah - גדר חיוב הסיבה
Pesach – Leaning During the Seder (Part 1)
The Rebbe analyzes whether leaning (heseibah) is a condition within mitzvos like matzah and the four cups, or an independent mitzvah of freedom. This affects whether one must repeat the mitzvah—and recite a new bracha—if leaning was omitted.