Sunan an-Nasa'i 3790
سنن النسائي#3790Sahihأَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، قَالَ حَدَّثَنَا ابْنُ عَوْنٍ، عَنِ الْحَسَنِ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ سَمُرَةَ، قَالَ قَالَ يَعْنِي رَسُولَ اللَّهِ صلى الله عليه وسلم " إِذَا حَلَفْتَ عَلَى يَمِينٍ فَرَأَيْتَ غَيْرَهَا خَيْرًا مِنْهَا فَأْتِ الَّذِي هُوَ خَيْرٌ مِنْهَا وَكَفِّرْ عَنْ يَمِينِكَ " .
Abdur-Rahman bin Samurah said:"The Messenger of Allah said: 'If you swear an oath, then you see something that is better, then do that which is better and offer expiation for your 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:
In-book reference: 35:30