Ashtangasamgraha 49.53

49.53

athāyasāni caturaṅguladīrghavistṛtāni tilotsedhāni patrāṇi kārayet |

tannyagnivarṇāni kṛtvāmalakasvarase nirvāpayedekaviṃśatikṛtvaḥ |

teṣāṃ tādṛśānāṃ palaśatamāyasyāṃ sthālyāṃ prakṣipyāmalakasvarasottaraṃ kṛtvā supihitaṃ bhasmahitaṃ bhasmarāśau nikhanet |

māsi māsi coddṛtyāyasena daṇḍena ghaṭṭayet |

śuṣyatyāmalakasvarasaṃ pūrvavadāvapet |

evaṃ tāni lohapatrāṇi saṃvatsarāt dravībhavanti |

tataścottarakālaṃ kṛtvā vamanavirecanaṃ snigdhatanureva kevalaṃ samantatoṅguṣṭhaparvamātramukhenāyasena sruveṇāyasa eva bhājane tasmāt kalkīkṛtāt sruvamekaṃ gṛhītvā madhudhṛtābhyāṃ pṛthak sruveṇa saṃyojya prāśnīyāt |

jīrṇe kṣīrarasayūṣāṇāmanyatamena sarpirmiśraṃ navaṃ ṣaṣṭikaudanamaśnīyāt |

anena vidhinā varṣamupayujya varṣameva cānyadapyuddiṣṭāhāro yantritātmā kuṭīṃ samadhivaset |

tataḥ sarvopatāpān jitvā vyādhijarāmaraṇaśastrāgnitoyaviṣāṇāmagamyaḥ sarvabhāveṣvatīndiryo varṣasahasradvayaṃ jīvati ||

Now, one should make iron plates four fingers long and broad and of the thickness of a sesame seed. / Heating them to the color of fire, one should quench them twenty-one times in āmalaka fresh juice. / Throwing one hundred palas of such [plates] into an iron pot, covering them with āmalaka fresh juice, and sealing it well, one should bury it in a heap of ashes. / Month by month, one should take it out and stir it with an iron rod. / As the āmalaka fresh juice dries up, one should add more as before. / In this way, those iron plates turn into liquid after a year. / Then, having later performed emesis and purgation, having the body oleated, one should take one ladleful from that paste using only an iron ladle whose mouth is all around the size of a thumb-joint, and placed in an iron vessel, combine it with a ladleful each of honey and ghee, and consume it. / When it is digested, one should eat fresh ṣaṣṭika-rice mixed with ghee along with milk, meat broth, or soup. / Using it according to this procedure for a year, and spending another year eating the prescribed diet with self-restraint, one should dwell in a cottage. / Then, having conquered all afflictions, invulnerable to diseases, old age, death, weapons, fire, water, and poisons, possessing senses that transcend all worldly things, one lives for two thousand years.