DHIKR

1
DHIKR
2

• 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."
• (Sahih Bukhari, Volume 1, Hadith 802)