Hadith 10:10
Abu Bakr narrated to us, he said: Waki’ narrated to us, from Hasan ibn Salih, from Bayan, from al-Sha’bi, who said: If he divorces her while she is pure (not menstruating), he has divorced her according to the Sunnah, even if he had intercourse with her.
حدثنا أبو بكر قال نا وكيع عن حسن بن صالح عن بيان عن الشعبي قال إذا طلقها وهي طاهر فقد طلقها للسنة وإن كان قد جامعها