Sahih Muslim 1244 b
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.
وَحَدَّثَنِي أَحْمَدُ بْنُ سَعِيدٍ الدَّارِمِيُّ، حَدَّثَنَا أَحْمَدُ بْنُ إِسْحَاقَ، حَدَّثَنَا هَمَّامُ بْنُ يَحْيَى، عَنْ قَتَادَةَ، عَنْ أَبِي حَسَّانَ، قَالَ قِيلَ لاِبْنِ عَبَّاسٍ إِنَّ هَذَا الأَمْرَ قَدْ تَفَشَّغَ بِالنَّاسِ مَنْ طَافَ بِالْبَيْتِ فَقَدْ حَلَّ الطَّوَافُ عُمْرَةٌ ‏.‏ فَقَالَ سُنَّةُ نَبِيِّكُمْ صلى الله عليه وسلم وَإِنْ رَغِمْتُمْ ‏.‏