Sahih al-Bukhari 6013
صحيح البخاري#6013Sahihحَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، قَالَ حَدَّثَنِي زَيْدُ بْنُ وَهْبٍ، قَالَ سَمِعْتُ جَرِيرَ بْنَ عَبْدِ اللَّهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ لاَ يَرْحَمُ لاَ يُرْحَمُ ".
Narrated Jarir bin `Abdullah:The Prophet (ﷺ) said, "He who is not merciful to others, will not be treated mercifully
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: 78:44