“I once heard abu Ja‘far (a.s.), saying, ‘A man would come to Ali ibn al-Husayn (a.s.), and his Kunyah was abu Murrah. When asking for permission at the door he would say, ‘This is abu Murrah at the door.’ Ali ibn al-Husayn (a.s.), said to him, ‘I swear you to Allah that when you come to our door do not say, ‘This is abu Murrah at the door (it is Kunyah of Satan).”’