(41) باب اسْتِحْبَابِ تَقْبِيلِ الْحَجَرِ الأَسْوَدِ فِي الطَّوَافِ
Ibn 'Umar (Allah be pleased with them) reported that Umar (Allah be pleased with him) kissed the Stone and said:
I am kissing you, whereas I know that you are a stone, but I saw Allah's Messenger (ﷺ) kissing you (that Is why I kiss you).
Reference: Sahih Muslim 1270 b
In-book reference: Book 15, Hadith 274
USC-MSA web (English) reference(deprecated numbering scheme): Book 7, Hadith 2913