صحيح مسلم
Sahih Muslim
كتاب القسامة
The Book of Oaths
باب نَدْبِ مَنْ حَلَفَ يَمِينًا فَرَأَى غَيْرَهَا خَيْرًا مِنْهَا أَنْ يَأْتِيَ الَّذِي هُوَ خَيْرٌ وَيُكَفِّرَ عَنْ يَمِينِهِ:
Chapter: It is recommended for the one who swears an oath then sees that something else is better than it; To do that which is better and offer expiation for his oath
Hadith 1650
This hadith is listed as number 4274 in Maktaba Shamila
وحَدَّثَنِي الْقَاسِمُ بْنُ زَكَرِيَّاءَ ، حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ ، حَدَّثَنِي سُلَيْمَانُ يَعْنِي ابْنَ بِلَالٍ ، حَدَّثَنِي سُهَيْلٌ فِي هَذَا الْإِسْنَادِ بِمَعْنَى حَدِيثِ مَالِكٍ فَلْيُكَفِّرْ يَمِينَهُ وَلْيَفْعَلِ الَّذِي هُوَ خَيْرٌ .
This hadith is narrated on the authority of Suhail with the same chain of transmitters (with these words): "He should expiate for (breaking) the vow and do that which is better."
