Epistle to the Son of the Wolf — Paragraph 43
Source (Persian)
و در مقام ديگر * ايّاکم ان تسفکوا الدّماء اخرجوا سيف اللّسان عن غمد البيان لانّ به تفتح مدائن القلوب * انّا رفعنا حکم القتل عن بينکم انّ الرّحمة سبقت الممکنات ان کنتم تعلمون *
Translation
And yet again in another connection: "Beware lest ye shed the blood of any one. Unsheathe the sword of your tongue from the scabbard of utterance, for therewith ye can conquer the citadels of men's hearts. We have abolished the law to wage holy war against each other. God's mercy hath, verily, encompassed all created things, if ye do but understand."