Narrated ‘Umar ibnul-Khattaab (radiyAllaahu ‘anhu), that he came to the Black Stone and kissed it and said:
((Verily, I know that you are a stone, and that you do not harm and do not benefit, and if I did not see the Messenger of Allaah (صلّى الله عليه وسلّم ) kiss you, then I would not kiss you)).
Narrated by al-Bukhaaree, no. 1520, 1528, 1532 and Muslim, no. 1270.
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Source: ‘al-Qawl-ul- Mufeed Fee Adillatit-Tawhid’ [Beneficial Speech in Establishing the Evidences of Tawhid] – Shaykh Muhammad al-Wasabi