Sahih Muslim 3664
صحيح مسلم#3664SahihYunus b. Jubair reported:I said to Ibn'Umar (Allah be pleased with them): A person divorcedhis wife while she was in the state of menses, whereupon he said: Do you know 'Abdullah b. Umar (Allah be pleased with them), for he divorced his wife in the state of menses. 'Umar (Allah be pleased with him) came to Allah's Apostle (ﷺ) and asked him, and he (the Holy Prophet) commanded him that he should take her back, and she started her 'Idda. I said to him: When a person divorces his wife, and she is in the state of menses, should that pronouncement of divorce be counted? He said: Why not, was he hopless or foolish?
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: 18:13