Sunan Abi Dawud 3262
سنن أبي داود#3262SahihNarrated Abdullah ibn Umar: The Prophet (ﷺ) said: If anyone swears an oath and makes an exception, he may fulfil it if he wishes and break it if he wishes without any accountability for breaking
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 22:21