Hadith 8:2720
Abu Bakr narrated to us, he said: Ibn Abi ‘Adi narrated to us, from Ash’ath, from al-Hasan, regarding a man who is interrupted by a need: He said, "He should cut off his circumambulation (tawaf) and restart it."
حدثنا أبو بكر قال نا بن أبي عدي عن أشعث عن الحسن في رجل تعرض له الحاجة قال يقطع طوافه ويستأنف