What was the custom of the Prophet Muhammad (saw) during the lifetime of Allah's people after the compulsory congregational prayer?
 Narrated Abu Ma`bad:                     (the freed slave of Ibn `Abbas) Ibn `Abbas told me, "In the lifetime of the Prophet it was the custom to celebrate Allah's praises aloud after the compulsory congregational prayers." Ibn `Abbas further said, "When I heard the Dhikr, I would learn that the compulsory congregational prayer had ended."