Hadith 10:393
Abu Bakr narrated to us, he said: Abu Khalid narrated to us, from Hajjaj, from ‘Amr ibn Shu‘ayb, from his father, from his grandfather ‘Abdullah ibn ‘Amr, regarding a man who gives his wife the choice [of divorce]: He said, "[It remains valid] as long as she is in her sitting."
حدثنا أبو بكر قال نا أبو خالد عن حجاج عن عمرو بن شعيب عن أبيه عن جده عبد الله بن عمرو في رجل يخير امرأته قال لها مادامت في مجلسها