Mahabharata 12.34.26

12.34.26

aśvamedho mahāyajñaḥ prāyaścittamudāhṛtam |
tamāhara mahārāja vipāpmaivaṃ bhaviṣyasi || 26 ||

Those wicked-souled persons who desire the extinction of virtue and who set sinfulness agoing deserve to be slain even as the furious Daityas were slain by the gods. If by slaying a single individual a family may be saved, or, if by slaying a single family the whole kingdom may be saved, such an act of slaughter will not be a transgression. Sin, O king, sometimes assumes the form of virtue, and virtue sometimes assumes the form of sin. They, however, that are learned, know which is which. Therefore, console thyself, O son of Pandu, for thou art well versed in the scriptures. Thou hast, O Bharata, only followed the path formerly trodden by the very gods. Men like yourselves never go to hell, O bull of Pandu's race! Comfort these thy brothers and all thy friends, O scorcher of foes! He who deliberately engages himself in sinful acts, and committing sinful acts feels no shame but continues the same as before, is called (in the scripture) a great sinner. There is no expiation for him and his sins know no diminution. Thou art born in noble race. Forced by the faults of others, thou hast most unwillingly done this, and having done this thou repentest of it. The Horse-sacrifice, that grand rite, has been indicated as an expiation for thee. Make preparations for that sacrifice, O monarch, and thou shalt be freed from thy sins. The divine chastiser of Paka, having vanquished his foes with the assistance of the Maruts, gradually performed a hundred sacrifices and became Satakratu.