Sunan an-Nasa'i 3782
سنن النسائي#3782SahihIt 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 35:22