Manava Dharmashastra 11.104

11.104

svayaṃ vā śiṣṇavṛṣaṇāv utkṛtyādhāya cāñjalau
nairṛtīṃ diśam ātiṣṭhed ā nipātād ajihmagaḥ //

He who has violated his Guru's bed, shall, after confessing his crime, extend himself on a heated iron bed, or embrace the red-hot image (of a woman); by dying he becomes pure;