Abu Tufayl reported that they were (performing tawaf) with Sayyidina Ibn Abbas (RA) and Mu’awiyah (RA)would never go by a corner without kissing it. So, Sayyidina Ibn Abbas (RA) said to him, “Surely the Prophet never kissed (any corner) except the Hajr Aswad and Rukn Yamani.” Sayyidina Mu’awiyah (RA) said, “There is nothing in the House that may be forsaken.”
[Bukhari 849, Muslim 1269]