Sahih al-Bukhari 53:15
Narrated Aisha:
Once Allah's Messenger (ﷺ) heard the loud voices of some opponents quarreling at the door. One of them was appealing to the other to deduct his debt and asking him to be lenient but the other was saying, "By Allah I will not do so." Allah's Messenger (ﷺ) went out to them and said, "Who is the one who was swearing by Allah that he would not do a favor?" That man said, "I am that person, O Allah's Messenger (ﷺ)! I will give my opponent whatever he wishes."
Reference
Sahih al-Bukhari 53:15
In-book reference
Book 53, Hadith 15
Arabic Text
حَدَّثَنَا إِسْمَاعِيلُ بْنُ أَبِي أُوَيْسٍ، قَالَ حَدَّثَنِي أَخِي، عَنْ سُلَيْمَانَ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ أَبِي الرِّجَالِ، مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ أَنَّ أُمَّهُ، عَمْرَةَ بِنْتَ عَبْدِ الرَّحْمَنِ قَالَتْ سَمِعْتُ عَائِشَةَ ـ رضى الله عنها ـ تَقُولُ سَمِعَ رَسُولُ اللَّهِ صلى الله عليه وسلم صَوْتَ خُصُومٍ بِالْبَابِ عَالِيَةٍ أَصْوَاتُهُمَا، وَإِذَا أَحَدُهُمَا يَسْتَوْضِعُ الآخَرَ، وَيَسْتَرْفِقُهُ فِي شَىْءٍ وَهْوَ يَقُولُ وَاللَّهِ لاَ أَفْعَلُ. فَخَرَجَ عَلَيْهِمَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ " أَيْنَ الْمُتَأَلِّي عَلَى اللَّهِ لاَ يَفْعَلُ الْمَعْرُوفَ ". فَقَالَ أَنَا يَا رَسُولَ اللَّهِ، وَلَهُ أَىُّ ذَلِكَ أَحَبَّ.