Sahih Muslim Book 007, Hadith Number 2916.
Chapter : Excellence of kissing the black stone ;while circumambulating.
Suwaid b. Ghafala reported: I saw Umar (Allah be pleased with him) kissing the Stone and clinging to it and saying: I saw Allah's Messenger (may peace be upon him) having great love for you. This Hadith has been narrated on the authority of Sufyan with the same chain of transmitters (and the words are): "That he ('Umar) said: But I saw Abu'l-Qasim (way peace be upon him) having great love for you." And he did not mention about clinging to it.