I have not stopped touching these two corners, the Yemeni corner and the Black Stone, ever since I saw the Messenger of Allah ﷺ touch them, neither in hardship nor in ease.
أخبرنا عبيد الله بن سعيد قال حدثنا يحيى عن عبيد الله عن نافع قال
ما تركت استلام هذين الركنين منذ رأيت رسول الله ﷺ يستلمهما اليماني والحجر في شدة ولا رخاء
Muslim narrated it, no. 1268, see the previous hadith from Ubaydullah bin Saeed, and Bukhari, Hajj, chapter on ramal in Hajj and Umrah, no. 1606, from the hadith of Yahya Qattan, through the same chain. Ubaydullah is Ibn Umar.