Black Stone

Bukhari : Book 2 : Volume 26 : Hadith No# 667 Narrated 'Abis bin Rabia: 'Hazrat Umar(R.A) came near the Black Stone(Hajr-E-Aswad) and kissed it and said "No doubt, I know that you are a stone and can neither benefit anyone nor harm anyone. Had I not seen Allah's Apostle kissing youI would not have kissed you."