What did `Umar bin Al-Khattab say when he kissed the Black Stone after he had seen the Prophet Muhammad (peace be upon him) kissing it?
 Narrated Zaid bin Aslam that his father said:                     "I saw `Umar bin Al-Khattab kissing the Black Stone and he then said, (to it) 'Had I not seen Allah's Apostle kissing you, (stone) I would not have kissed you.' "