Sahih Muslim 4253
صحيح مسلم#4253Sahihوَحَدَّثَنِي هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ، وَيُونُسُ بْنُ عَبْدِ الأَعْلَى، وَأَحْمَدُ بْنُ عِيسَى، قَالَ يُونُسُ أَخْبَرَنَا وَقَالَ الآخَرَانِ، حَدَّثَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، عَنْ كَعْبِ بْنِ، عَلْقَمَةَ عَنْ عَبْدِ الرَّحْمَنِ بْنِ شُمَاسَةَ، عَنْ أَبِي الْخَيْرِ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " كَفَّارَةُ النَّذْرِ كَفَّارَةُ الْيَمِينِ " .
Uqba. b. Amir reported Allah's Messenger (ﷺ) as saying:The expiation of the (breach of) a vow is the same as that of the (breach of an oath)
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 Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 26:18