Abu al-Tufayl said that he saw Mu'awiyah (may Allah be pleased with him) circumambulating the Ka'bah, with Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) on his left, and I was walking behind the two of them, listening to their conversation. Mu'awiyah (may Allah be pleased with him) began touching the two corners on the side of the Hijr (Hatim), and Sayyiduna Ibn Abbas (may Allah be pleased with them both) would say to him: The Messenger of Allah (peace and blessings be upon him) did not touch these two corners. And Mu'awiyah (may Allah be pleased with him) would say: Leave me alone, O Ibn Abbas, for nothing of it is to be neglected.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10586