سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 3789
The Book of Oaths and Vows
Expiation After Breaking An Oath
أَخْبَرَنَا زِيَادُ بْنُ أَيُّوبَ، قَالَ حَدَّثَنَا هُشَيْمٌ، قَالَ أَنْبَأَنَا مَنْصُورٌ، وَيُونُسُ، عَنِ الْحَسَنِ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ سَمُرَةَ، قَالَ قَالَ لِي النَّبِيُّ صلى الله عليه وسلم إِذَا آلَيْتَ عَلَى يَمِينٍ فَرَأَيْتَ غَيْرَهَا خَيْرًا مِنْهَا فَأْتِ الَّذِي هُوَ خَيْرٌ وَكَفِّرْ عَنْ يَمِينِكَ .
It was narrated that 'Abdur-Rahman bin Samurah said: "The Prophet (ﷺ) said to me: 'If you swear an oath, and you see something that is better, then do that which is better and offer expiation for your oath.'"
Sunan an-Nasa'i, 3789sahih (Darussalam)