Musnad Abu Ya'la al-Mawsili 111:107

Zuhayr narrated to us, al-Hasan ibn Musa narrated to us, Thabit Abu Zayd narrated to us, from Abdullah ibn Uthman ibn Khuthaym, the uncle of Sa'id ibn Jubayr, from Ibn Abbas, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, this Stone has a tongue and two lips; it will testify on the Day of Resurrection for whoever touched it, in truth."