(2) باب طَلاَقِ السُّنَّةِ
It was narrated that 'Abdullah said:
"The Sunnah divorce is to divorce her when she is pure (not menstruating) without having had intercourse with her."
Reference: Sunan an-Nasa'i 3395
In-book reference: Book 27, Hadith 7
English translation: Vol. 4, Book 27, Hadith 3424