Hadith 10:641
Abu Bakr narrated to us, he said: Abu Dawud narrated to us, from Abu Hurrah, from al-Hasan, regarding a man who was told, "You have divorced your wife," and he had not divorced her, so he said, "Yes." Al-Hasan said: "She has indeed been divorced."
حدثنا أبو بكر قال نا أبو داود عن أبي حرة عن الحسن في رجل قيل له طلقت امرأتك ولم يكن طلقها فقال نعم فقال الحسن فقد طلقت