(V.15:98).
a) Narrated Abu Ma‘bad, the freed slave of Ibn ‘Abbâs: Ibn ‘Abbâs رضي الله عنهما told me, "In the lifetime of the Prophet صلى الله عليه وسلم , it was the custom to remember Allâh (Dhikr) by glorifying, praising and magnifying Allâh aloud after the compulsory congregational prayers." Ibn ‘Abbâs further said, "When I heard the (Dhikr), I would learn that the compulsory congregational prayer had ended." (Sahih Al-Bukhari, Vol.1, Hadîth No.802).
b) Narrated Ibn ‘Abbâs رضي الله عنهما: I used to recognize the completion of the prayer of the Prophet صلى الله عليه وسلم by hearing Takbîr (Sahih Al-Bukhari, Vol.1, Hadith No.803).
(V.15:99) Narrated Anas رضي الله عنه: Allâh’s Messenger صلى الله عليه وسلم said, "None of you should long for death because of a calamity that had befallen him; and if he cannot, but long for death, then he should say, ‘O Allâh! Let me live as long as life is better for me, and take my life if death is better for me’" (Sahih Al-Bukhari, Vol.8, Hadith No.362).