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طَافَ النَّبيُّ صلى الله عليه وسلم بِالْبَيْتِ عَلَى بَعِيرٍ كُلَّمَا أَتَى الرُّكْنَ أَشَارَ إِلَيْهِ بِشَيْءٍ عِنْدَهُ وَكَبَّرَ
(The Prophet r circled the KaAAbah on a camel, every time he reached the black stone he would point to it with his staff and say: (Allah is the greatest))
Source: Al-Bukhari.