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Ibn ʿAbbās said:
طَافَ النَّبِيُّ صلى الله عليه وسلم بِالْبَيْتِ عَلَى بَعِيرٍ، كُلَّمَا أَتَى الرُّكْنَ أَشَارَ إِلَيْهِ بِشَىْءٍ كَانَ عِنْدَهُ وَكَبَّرَ
Tafan-nabiyyu sallallahu 'alayhi wasallama bil-bayti 'ala ba'ir, kullama atar-rukna ashara ilayhi bisha'in kana 'indahu wakabbar
The Prophet ﷺ went round the House on a camel; every time he came to the Corner, he pointed to it with something he had with him and said takbīr (Allah is the Greatest).
The Corner is the corner of the Black Stone.
Source Ṣaḥīḥ al-Bukhārī 1613 Ṣaḥīḥ
Compiler cites al-Bukhārī (Fatḥ al-Bārī 3/472, 476)