Sahih al-Bukhari 1610

Arabic

حَدَّثَنَا أَحْمَدُ بْنُ سِنَانٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَخْبَرَنَا وَرْقَاءُ، أَخْبَرَنَا زَيْدُ بْنُ أَسْلَمَ، عَنْ أَبِيهِ، قَالَ رَأَيْتُ عُمَرَ بْنَ الْخَطَّابِ ـ رضى الله عنه ـ قَبَّلَ الْحَجَرَ وَقَالَ لَوْلاَ أَنِّي رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم قَبَّلَكَ مَا قَبَّلْتُكَ‏.‏

English translation

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

Reference: Sahih al-Bukhari 1610, Book of Hajj (Pilgrimage). English translation by Dr. Muhammad Muhsin Khan.