(15) باب الْكَفَّارَةِ قَبْلَ الْحِنْثِ
It was narrated from 'Abdur-Rahman bin Samurah that the Messenger of Allah said:
"If any one of you swears an oath, then he sees something better than it, let him offer expiation for his oath, and look at what is better and do it."
Reference: Sunan an-Nasa'i 3782
In-book reference: Book 35, Hadith 22
English translation: Vol. 4, Book 35, Hadith 3813