Musannaf Ibn Abi Shayba 8:2112

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Ibn Jurayj, from Muhammad ibn ‘Abbad ibn Ja’far, who said: I saw Ibn ‘Abbas come on the Day of Tarwiyah, then he kissed the Stone, then he prostrated upon it. He did that three times.