Debate of Beit Hillel and Beit Shammai (Pes. Mishnah 10:6) Concerning Hallel on the night of Pesach - "How far does one recite?"; The viewpoints of Beit Hillel and Beit Shammai in many places in Talmud whether we follow "potential" or "actual" aspects and the necessity for all the references that desribe their argument