حَدَّثَنَا عَلِيُّ بْنُ سَلَمَةَ، حَدَّثَنَا مَالِكُ بْنُ سُعَيْرٍ، حَدَّثَنَا هِشَامٌ، عَنِ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ أُنْزِلَتْ هَذِهِ الآيَةُ ‏{‏لاَ يُؤَاخِذُكُمُ اللَّهُ بِاللَّغْوِ فِي أَيْمَانِكُمْ‏}‏ فِي قَوْلِ الرَّجُلِ لاَ وَاللَّهِ، وَبَلَى وَاللَّهِ‏.‏
Translation
Narrated Aisha

That her father (Abu Bakr) never broke his oath till Allah revealed the order of the legal expiation for oath. Abu Bakr said, "If I ever take an oath (to do something) and later find that to do something else is better, then I accept Allah's permission and do that which is better, (and do the legal expiation for my oath ) ".