Abis bin Rabi’ah said on the authority of ‘Umar He(‘Umar) came to the (Black) Stone and said “ I know for sure that you are a stone which can neither benefit nor injure and had I not seen the Apostle of Allaah ﷺ kissing you, I would not have kissed you.”  

إِنِّي أَعْلَمُ أَنَّكَ حَجَرٌ لاَ تَنْفَعُ وَلاَ تَضُرُّ وَلَوْلاَ أَنِّي رَأَيْتُ رَسُولَ اللَّهِ ﷺ يُقَبِّلُكَ مَا قَبَّلْتُكَ