عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ مَنْ حَلَفَ عَلَى يَمِينٍ فَرَأَى خَيْرًا مِنْهَا فَكَفَّارَتُهَا تَرْكُهَا
It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever swears an oath about something, but then finds something else to be better, the expiation for that oath is that the person should abandon it.