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29. "The best of days that you should perform cupping are the 17th, 19th and 21st of the month. I did not pass a single gathering of angels on the night of Isrâ' except that they would say to me, 'O Muhammad, perform cupping!'" [Ahmad, Sahîh]

11. It was narrated that Abu Hanifa said to Dawud al-Taa’i, “Why do you prefer seclusion?” Dawud replied, “To struggle against myself to leave disputing.” Abu Hanifah said, “Attend meetings, listen to what is said, and remain silent.” Dawud said, “I have done so, but I have found nothing heavier than this.”