Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that Sayyiduna Umar (may Allah be pleased with him) kissed the Black Stone and then said: "Be aware! By Allah, I know well that you are only a stone (which has no power to benefit or harm), and if I had not seen the Messenger of Allah (peace and blessings be upon him) kissing you, I would not have kissed you." Janab Amr says that Zaid bin Aslam narrated this hadith to me from his noble father Aslam in the same manner.