Musnad Ahmad 25:513

Ya'qub narrated to us, my father narrated to us, from Salih ibn Kaysan, he said: Ibn Shihab said: 'Ubayd Allah ibn 'Abd Allah ibn 'Utbah ibn Mas'ud informed me, that 'Abd Allah ibn 'Abbas informed him, that the Messenger of Allah, peace and blessings of Allah be upon him, wrote—and he mentioned it.