What did the Prophet Muhammad (saw) observe for a month in the dawn prayer after ruku' and invoke curse upon?
 Anas b. Malik reported:                      The Messenger of Allah (may peace be upon him) observed Qunut for a month in the dawn prayer after ruku' and invoked curse upon Ri'l, Dhakwan, and said that 'Usayya had disobeyed Allah and His Apostle (may peace be upon him).