(15) باب الْكَفَّارَةِ قَبْلَ الْحِنْثِ
'Amr bin Shu'aib narrated from his father, from his grandfather, that the Messenger of Allah said:
"Whoever swears an oath, then sees something better than it, let him do that which is better."
Reference: Sunan an-Nasa'i 3781
In-book reference: Book 35, Hadith 21
English translation: Vol. 4, Book 35, Hadith 3812