What lesson can be learnt from the hadith narrated by Aisha about her father Abu Bakr (ra) regarding taking an oath and finding something better?
 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 ) ".