Sahih al-Bukhari 642

Call to Prayers (Adhaan)

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حَدَّثَنَا أَبُو مَعْمَرٍ عَبْدُ اللَّهِ بْنُ عَمْرٍو، قَالَ حَدَّثَنَا عَبْدُ الْوَارِثِ، قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ صُهَيْبٍ، عَنْ أَنَسٍ، قَالَ أُقِيمَتِ الصَّلاَةُ وَالنَّبِيُّ صلى الله عليه وسلم يُنَاجِي رَجُلاً فِي جَانِبِ الْمَسْجِدِ، فَمَا قَامَ إِلَى الصَّلاَةِ حَتَّى نَامَ الْقَوْمُ‏.‏

Narrated Anas:Once the Iqama was pronounced and the Prophet (ﷺ) was talking to a man (in a low voice) in a corner of the mosque and he did not lead the prayer till (some of) the people had slept (dozed in a sitting posture)

Reference
Sahih al-Bukhari 642
In-book
Book 10, Hadith 39
English
Muhsin Khan