I saw'lbn 'Umar (Allah be pleased with them) touching the Stone with his hand and then kissing his hand. and he said: I have never abandoned it since I saw Allah's Messenger (way peace be upon him) doing It.
Sahih Muslim Book 15, Hadith 271
← Previous Hadith I have not abandoned touching of Yamani corners (and kissing of) the Stone since I saw Allah's messenger (ﷺ) touching them both In hardship and ease.

Sahih Muslim Book 15, Hadith 270 Next Hadith → Ibn 'Abbas (Allah be pleased with them) is reported to have said that he did not see Allah's Messenger (ﷺ) touching other than the Yamani corners.

Sahih Muslim Book 15, Hadith 272