Sahih Al Bukhari Hadith Number 1611

Narrated Az-Zubair bin ‘Arabi: A man asked Ibn `Umar about the touching of the Black Stone. Ibn `Umar said, “I saw Allah’s Messenger (peace eb upon him) touching and kissing it.” The questioner said, “But if there were a throng (much rush) round the Ka`ba and the people overpowered me, (what would I do?)” He replied angrily, “Stay in Yemen (as that man was from Yemen). I saw Allah’s Messenger (peace eb upon him) touching and kissing it.”