ENOfficial
It was narrated that `Abis bin Rabee’ah said: I saw `Umar go to the Black Stone and say: By Allah, I know that you are a stone and cannot cause harm or bring benefit. Were it not that I saw the Messenger of Allah (ﷺ) kiss you, I would not have kissed you. Then he leant down and kissed it.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ، حَدَّثَنَا الْأَعْمَشُ، عَنْ إِبْرَاهِيمَ، عَنْ عَابِسِ بْنِ رَبِيعَةَ، قَالَ رَأَيْتُ عُمَرَ رَضِيَ اللَّهُ عَنْهُ أَتَى الْحَجَرَ فَقَالَ أَمَا وَاللَّهِ إِنِّي لَأَعْلَمُ أَنَّكَ حَجَرٌ لَا تَضُرُّ وَلَا تَنْفَعُ وَلَوْلَا أَنِّي رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَبَّلَكَ مَا قَبَّلْتُكَ ثُمَّ دَنَا فَقَبَّلَهُ.
sunnah.com