Hadith 6:43
'Umar (RAA) narrated that he kissed the Black Stone and said, ‘I know that you are a stone and can neither benefit anyone nor harm anyone. Had I not seen Allah’s Messenger(ﷺ) kissing you, I would not have kissed you.’ Agreed upon.
وَعَنْ عُمَرَ - رضى الله عنه - { أَنَّهُ قَبَّلَ اَلْحَجَرَ [ اَلْأَسْوَدَ ] فَقَالَ: إِنِّي أَعْلَمُ أَنَّكَ حَجَرٌ لَا تَضُرُّ وَلَا تَنْفَعُ, وَلَوْلَا أَنِّي رَأَيْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -يُقَبِّلُكَ مَا قَبَّلْتُكَ } مُتَّفَقٌ عَلَيْهِ
Original Reference: Bulugh al-Maram 750