Sahih al-Bukhari 2294
صحيح البخاري#2294Sahihحَدَّثَنَا مُحَمَّدُ بْنُ الصَّبَّاحِ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ زَكَرِيَّاءَ، حَدَّثَنَا عَاصِمٌ، قَالَ قُلْتُ لأَنَسٍ رضى الله عنه أَبَلَغَكَ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " لاَ حِلْفَ فِي الإِسْلاَمِ ". فَقَالَ قَدْ حَالَفَ النَّبِيُّ صلى الله عليه وسلم بَيْنَ قُرَيْشٍ وَالأَنْصَارِ فِي دَارِي.
Narrated `Asim:I heard Anas bin Malik, "Have you ever heard that the Prophet (ﷺ) said, 'There is no alliance in Islam?' " He replied, "The Prophet (ﷺ) made alliance between Quraish and the Ansar in my house
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: 39:5