Taken from Bro Abu Mussab Wajdi Akkari lecture titled Horn of Satan

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[Saheeh Bukhari]

I. Volume 2, Book 26, Number 667:

Narrated 'Abis bin Rabia:
'Umar came near the Black Stone 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 you I would not have kissed you."

II. Volume 2, Book 26, Number 675:

Narrated Zaid bin Aslam from his father who said:
"Umar bin Al-Khattab addressed the Corner (Black Stone) saying, 'By Allah! I know that you are a stone and can neither benefit nor harm. Had I not seen the Prophet touching (and kissing) you, I would never have touched (and kissed) you.' Then he kissed it and said, 'There is no reason for us to do Ramal (in Tawaf) except that we wanted to show off before the pagans, and now Allah has destroyed them.' 'Umar added, '(Nevertheless), the Prophet did that and we do not want to leave it (i.e. Ramal).'

Ini haditsnya: Amirul Mu'minin, Umar bin Khattab Radhiallaahu anhu ketika beliau mencium hajar aswad mengatakan, "Sesungguhnya aku tahu bahwa engkau (hajar aswad) tidak dapat mendatangkan bahaya, tidak juga manfa'at. Kalau sekiranya aku tidak melihat Rasulullah Shalallaahu alaihi wasalam menciummu, niscaya aku tidak akan menciummu." riwayat bukhari nombor 1610.