Chagigah 4a-5b
The Lubavicher Rebbe asked Rav Moshe: does the command of ascension to the temple on pilgrimage festivals include the act of ascending, or is it merely a practical requirement to fulfill the command of placing oneself there? \u2022 Who is exempt from the command of ascension and how are the various exemptions derived? \u2022 Can spiritual bureaucratic errors happen? \u2022 Can a person merit additional years to his life?