And Zuhayr ibn Harb narrated to us: Yahya ibn Sa'id narrated to us, from Ibn 'Ajlan, who said: Sayfi narrated to me, from Abu al-Sa'ib, from Abu Sa'id al-Khudri, who said: I heard him say: The Messenger of Allah, peace and blessings be upon him, said: "Indeed, in Medina there are a group of jinn who have embraced Islam. So whoever sees any of these creatures [that dwell in homes] should warn it three times. If it appears to him after that, then let him kill it, for it is a devil."