(1) باب مَا جَاءَ فِي طَلاَقِ السُّنَّةِ
Salim narrated that:
His father divorced his wife during her menses, so Umar asked the Prophet about that and he said: "Tell him to take her back, then let him divorce her while she is pure or pregnant." (ID)
Reference (ID): Jami` at-Tirmidhi 1176 (ID)
In-book reference (ID): Book 13, Hadith 2 (ID)
English translation (ID): Vol. 2, Book 8, Hadith 1176 (ID)