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.