Ubayd bin Jurayj said to Abdullah bin Umar (may Allah be pleased with them both): "I have seen that you touch only the two Yamani corners." He said: "I did not see the Messenger of Allah (peace and blessings be upon him) touch any but the two Yamani corners."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9239