(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." (ID)
Reference (ID): Sunan an-Nasa'i 3395 (ID)
In-book reference (ID): Book 27, Hadith 7 (ID)
English translation (ID): Vol. 4, Book 27, Hadith 3424 (ID)