Sunan an-Nasai 17697
In-book no 2961أَخْبَرَنَا بِشْرُ بْنُ هِلاَلٍ، قَالَ أَنْبَأَنَا عَبْدُ الْوَارِثِ، عَنْ خَالِدٍ، عَنْ عِكْرِمَةَ، عَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَطُوفُ بِالْبَيْتِ عَلَى رَاحِلَتِهِ فَإِذَا انْتَهَى إِلَى الرُّكْنِ أَشَارَ إِلَيْهِ .
It was narrated from Abdullah bin Abbas that: the Messenger of Allah used to circumambulate the House on his mount, and when he reached the Corner be pointed to it."