Nahjul Balagha Letter 37

To Muawiya

Glory be to Allah! How staunchly you cling to innovated passions and painful bewilderment along with ignoring the facts and rejecting strong reasons which are liked by Allah and serve as pleas for the people. As regards your prolonging the question of Uthman's murder the position is that you helped Uthman when it was really your own help while you forsook him when he was in need of help; and that is an end to the matter.