The Book of Pilgrimage (Kitab Al-Hajj)
Muslim :: Book 7 : Hadith 2868
Abu Hassan reported: It was said to Ibn 'Abbas (Allah be pleased with them) that this affair had engaged the attention of the people that he who circumambu- lates the House was permitted to circumambulate for Umra (even though he was in a state of Ihram for Hajj), whereupon he said: That is the Sunnah of your Apostle (may peace be upon him), even though you may not approve of it.