By living upon one meal a month, one may be cleansed in a year. By an absolute fast, one may be cleansed within a very short time, one is again purified by a Horse-sacrifice. Men that have been guilty of Brahmanicide and who have succeeded in taking the final bath at the completion of the Horse-sacrifice, become washed off all their sins. This is highly authoritative injunction of the Shrutis. One again, by renouncing his life in a battle undertaking for a Brahmana, becomes cleansed of the sin of Brahmanicide.
संवत्सरेण मासाशी पूयते नात्र संशयः। तथैवोपवसन् राजन् स्वल्पेनापि प्रपूयते॥ क्रतुना चाश्वमेधेन पूयते नात्र संशयः। ये चाप्यवभृथस्नाताः केचिदेवंविधा नराः॥ ते सर्वे धूतपाप्मानो भवन्तीति परा श्रुतिः। ब्राह्मणार्थे हतो युद्धे मुच्यते ब्रह्महत्यया॥