Sahih al-Bukhari 1200
صحيح البخاري#1200Sahihحَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا عِيسَى ـ هُوَ ابْنُ يُونُسَ ـ عَنْ إِسْمَاعِيلَ، عَنِ الْحَارِثِ بْنِ شُبَيْلٍ، عَنْ أَبِي عَمْرٍو الشَّيْبَانِيِّ، قَالَ قَالَ لِي زَيْدُ بْنُ أَرْقَمَ إِنْ كُنَّا لَنَتَكَلَّمُ فِي الصَّلاَةِ عَلَى عَهْدِ النَّبِيِّ صلى الله عليه وسلم، يُكَلِّمُ أَحَدُنَا صَاحِبَهُ بِحَاجَتِهِ حَتَّى نَزَلَتْ {حَافِظُوا عَلَى الصَّلَوَاتِ} الآيَةَ، فَأُمِرْنَا بِالسُّكُوتِ.
Narrated Zaid bin Arqam:In the lifetime of the Prophet (ﷺ) we used to speak while praying, and one of us would tell his needs to his companions, till the verse, 'Guard strictly your prayers (2.238) was revealed. After that we were ordered to remain silent while praying
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 21:4