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
← Previous Hadith Nafi' reported on the authority of 'Abdullah (Allah be pleased with him) that Allah's Messenger (way peace be upon him) did not touch but the Stone and the Yamani corner.

Sahih Muslim Book 15, Hadith 269 Next Hadith → 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