حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ هِشَامٍ، قَالَ: أَخْبَرَنِي أَبِي أَنَّ عُمَرَ
رَضِيَ اللَّهُ عَنْهُ قَالَ لِلْحَجَرِ إِنَّمَا أَنْتَ حَجَرٌ وَلَوْلَا أَنِّي رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُقَبِّلُكَ مَا قَبَّلْتُكَ ثُمَّ قَبَّلَهُ
My father told me that Umar ibn al-Khattab (رضي الله عنه) said to the Stone; You are only a stone; were it not that I saw the Messenger of Allah (sallallahu alayhi wa sallam) kiss you, I would not have kissed you. Then he kissed it.
Musnad Ahmad 358, Book 2, Musnad `Umar b. al-Khattab (ra), Hadith 281. 1 min read