Takbir at the Black Stone (Saying Allahu Akbar when passing the Black Stone)

طَافَ النَّبيُّ صلى الله عليه وسلم بِالْبَيْتِ عَلَى بَعِيرٍ كُلَّمَا أَتَى الرُّكْنَ أَشَارَ إِلَيْهِ بِشَيْءٍ عِنْدَهُ وَكَبَّرَ

The Prophet circled the Kaʿbah on a camel, every time he reached the black stone he would point to it with his staff and say: Allah is the greatest