From Sahih Muslim (Hadith 3019):
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 (ﷺ), even though you may not approve of it
Reference: Muslim 3019