(3) باب مَا يَفْعَلُ إِذَا طَلَّقَ تَطْلِيقَةً وَهِيَ حَائِضٌ
It 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." (FR)
Reference (FR): Sunan an-Nasa'i 3397 (FR)
In-book reference (FR): Book 27, Hadith 9 (FR)
English translation (FR): Vol. 4, Book 27, Hadith 3426 (FR)