وَحَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، عَنْ عَبْدِ الْعَزِيزِ بْنِ رُفَيْعٍ، عَنْ تَمِيمِ بْنِ طَرَفَةَ، عَنْ عَدِيِّ بْنِ حَاتِمٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَنْ حَلَفَ عَلَى يَمِينٍ فَرَأَى غَيْرَهَا خَيْرًا مِنْهَا فَلْيَأْتِ الَّذِي هُوَ خَيْرٌ وَلْيَتْرُكْ يَمِينَهُ ‏"‏ ‏.‏

'Adi b. Hatim reported Allah's Messenger (PBUH) as saying: He who took an oath, but he found something else better than that, should do that which is better and break his oath. Translation Not Available

Book Ref: Sahih Muslim Book 27 Hadith 4057
Web Ref:  Sahih Muslim Book 15 Hadith 1651 b