Sunan an-Nasa'i 3397
سنن النسائي#3397SahihIt was narrated from Ibn 'Umar that he divorced his wife while she was menstruating. He mentioned that to the Prophet and he said:"Tell him to take her back, then divorce her while she is pure (not menstruating) or pregnant
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 Muslim
In-book reference: 27:9