Sunan an-Nasa'i 3829
سنن النسائي#3829SahihIt was narrated that Ibn 'Umar said:"The Messenger of Allah said: 'Whoever swears an oath and says: If Allah wills, then he has made an exception
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 ZaiHasan
In-book reference: 35:69