Salim narrated on the authority of his father (RA) that 'Umar bin al-Khattib (RA) kissed (the Black Stone) and then said: By Allah, I know that you are a stone and if I were not to see Allah's Messenger (ﷺ) kissing you, I would not have kissed you. Harun said in his narration: A hadith like this has been transmitted to me by Zaid bin Aslam on the authority of his father Aslam.
Ibn 'Umar (RA) reported that Umar (RA) 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).
Abdullah bin Sarjis reported: I saw the bald one, i. e. 'Umar bin Khattib (RA) kissing the Stone and saying: By Allah. I am kissing with full consciousness of the fact that you are a stone and that you can neither do any harm nor good; and if I had not seen Allah's Messenger (ﷺ) kissing you, I would not have kissed you. The rest of the hadith is the same.
Abbas bin Rabi'a reported: I saw 'Umar (RA) kissing the Stone and saying: I am kissing you and I know that you are a stone. And if I had not seen Allah's Messenger (ﷺ) kissing you, I would not have kissed 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 (ﷺ) having great love for you." And he did not mention about clinging to it.