For his purification the slayer of a Brahmana shall make a hut in the forest and dwell (in it) during twelve years, subsisting on alms and making the skull of a dead man his flag.
लक्ष्यं शस्त्रभृतां वा स्याद् विदुषामिच्छयाऽत्मनः । प्रास्येदात्मानमग्नौ वा समिद्धे त्रिरवाक्षिराः ॥ ७३ ॥
Or let him, of his own free will, become (in a battle) the target of archers who know (his purpose); or he may thrice throw himself headlong into a blazing fire;
Or, in order to remove (the guilt of) slaying a Brahmana, he may walk one hundred yoganas, reciting one of the Vedas, eating little, and controlling his organs;