Sahih Muslim 2520
صحيح مسلم#2520SahihZuhri reported that (once) the Messenger of Allah (ﷺ) took an oath that he would not go to his wives for one Month. Zuhri said that 'Urwa narrated to him from 'A'isha (Allah be pleased with her) that she said:When twenty-nine nights were over, which I had counted, the Messenger of Allah (ﷺ) came to me (he came to me first of all). I said: Messenger of Allah, you had taken an oath that you would not come to us for a month, whereas you have come after twenty nine days which I have counted. Whereupon he said: The month may also consist of twenty-nine days
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 13:26