Characteristics of Prayer
Bukhari :: Book 1 :: Volume 12 :: Hadith 802
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."
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