"Whoever swears an oath, then sees something better than it, let him do that which is better." (Using translation from Nasāʾī 3781)  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «مَنْ حَلَفَ عَلَى يَمِينٍ فَرَأَى غَيْرَهَا خَيْرًا مِنْهَا فَلْيَأْتِ الَّذِي هُوَ خَيْرٌ وَلْيُكَفِّرْ عَنْ يَمِينِهِ»  

The Prophet ﷺ said, "O ʿAbdur-Rahman bin Samura! Do not seek to be a ruler, because if you are given authority for it, then you will be held responsible for it, but if you are given it without asking for it, then you will be helped in it (by Allah): and whenever you take an oath to do something and later you find that something else is better than the first, then do the better one and make expiation for your oath." (Using translation from Bukhārī 6622)  

قَالَ رَسُولُ اللَّهِ ﷺ يَا عَبْدَ الرَّحْمَنِ بْنَ سَمُرَةَ «لَا تَسْأَلِ الْإِمَارَةَ فَإِنَّكَ إِنْ أُعْطِيتَهَا عَنْ مَسْأَلَةٍ وُكِلْتَ إِلَيْهَا وَإِنْ أُعْطِيتَهَا مِنْ غَيْرِ مَسْأَلَةٍ أُعِنْتَ عَلَيْهَا فَإِذَا حَلَفْتَ عَلَى يَمِينٍ فَرَأَيْتَ غَيْرَهَا خَيْرًا مِنْهَا فَكَفِّرْ عَنْ يَمِينِكَ وَأْتِ الَّذِي هُوَ خَيْرٌ»  

The Messenger of Allah ﷺ as saying: He then mentioned the rest of the tradition to the same effect as mentioned by Sufyan. (Using translation from Abū Dāʾūd 4540)   

قَالَ رَسُولُ اللَّهِ ﷺ فَذَكَرَ نَحْوَ الْحَدِيثِ