Yahya related to me from Malik from Nafi that Abdullah ibn Umarsaid, "When a man divorces his wife and she begins her third period,she is free from him and he is free from her."Malik said,"This is how things are done among us." (DE)
USC-MSA web (English) reference: Book 29, Hadith 58 (DE)
Arabic reference (DE): Book 29, Hadith 1219 (DE)