It was narrated from Ibn 'Abbas that 'Umar bin al-Khattab رضي الله عنه held onto the corner of the Ka'bah and said:

I know that you are only a stone; if I had not seen my Beloved kiss you or touch you, I would not have touched you or kissed you. “Indeed in the Messenger of Allah (Muhammad ﷺ) you have a good example to follow” (al-Ahzab 33:21].

حَدَّثَنَا عَفَّانُ، حَدَّثَنَا وُهَيْبٌ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عُثْمَانَ بْنِ خُثَيْمٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، رَضِيَ اللَّهُ عَنْهُ أَكَبَّ عَلَى الرُّكْنِ فَقَالَ إِنِّي لَأَعْلَمُ أَنَّكَ حَجَرٌ وَلَوْ لَمْ أَرَ حَبِيبِي صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَبَّلَكَ وَاسْتَلَمَكَ مَا اسْتَلَمْتُكَ وَلَا قَبَّلْتُكَ وَ لَقَدْ كَانَ لَكُمْ فِي رَسُولِ اللَّهِ أُسْوَةٌ حَسَنَةٌ‏.‏