Sahih al-Bukhari 6126
Narrated `Aisha:
Whenever Allah's Messenger (ﷺ) was given the choice of one of two matters he would choose the easier of 
the two as long as it was not sinful to do so, but if it was sinful, he would not approach it. Allah's 
Apostle never took revenge over anybody for his own sake but (he did) only when Allah's legal 
bindings were outraged, in which case he would take revenge for Allah's sake." (See Hadith No. 760. 
Vol. 4)
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ أَنَّهَا قَالَتْ مَا خُيِّرَ رَسُولُ اللَّهِ صلى الله عليه وسلم بَيْنَ أَمْرَيْنِ قَطُّ إِلاَّ أَخَذَ أَيْسَرَهُمَا، مَا لَمْ يَكُنْ إِثْمًا، فَإِنْ كَانَ إِثْمًا كَانَ أَبْعَدَ النَّاسِ مِنْهُ، وَمَا انْتَقَمَ رَسُولُ اللَّهِ صلى الله عليه وسلم لِنَفْسِهِ فِي شَىْءٍ قَطُّ، إِلاَّ أَنْ تُنْتَهَكَ حُرْمَةُ اللَّهِ، فَيَنْتَقِمَ بِهَا لِلَّهِ‏.‏