The Compendium of Caraka 1.14.46

1.14.46

atha jentākaṃ cikīrṣurbhūmiṃ parīkṣeta --- tatra pūrvasyāṃ diśyuttarasyāṃ vā guṇavati praśaste bhūmibhāge kṛṣṇamadhuramṛttike suvarṇamṛttike vā parīvāpapuṣkariṇyādīnāṃ jalāśayānāmanyatamasya kūle dakṣiṇe paścime vā sūpatīrthe samasuvibhaktabhūmibhāge saptāṣṭau vā 'aratnīrupakramyodakāt prāṅmukhamudaṅmukhaṃ vā 'abhimukhatīrthaṃ kūṭāgāraṃ kārayet, utsedhavistārataḥ paramaratnīḥ ṣoḍaśa, samantāt suvṛttaṃ mṛtkarmasaṃpannamanekavātāyanam; asya kṛṭāgārasḥyāntaḥ samantato bhittimaratnivistārotsedhāṃ piṇḍikāṃ kārayedākapāṭāt, madhye cāsya kūṭāgārasya catuṣkiṣkumātraṃ puruṣapramāṇaṃ mṛnmayaṃ kandusaṃsthānaṃ bahusūkṣmacchidramaṅgārakoṣṭhakastambhaṃ sapidhānaṃ kārayet; taṃ ca khādirāṇāmāśvakarṇādīnāṃ vā kāṣṭhānāṃ pūrayitvā pradīpayet; sa yadā jānīyāt sādhu dagdhāni kāṣṭhāni gatadhūmānyavataptaṃ ca kevalamagninā tadagnigṛhaṃ svedayogyena coṣmaṇā yuktamiti, tatrainaṃ puruṣaṃ vātaharābhyaktagātraṃ vastrāvacchannaṃ praveśayaṃścainamanuśiṣyāt --- śaumya! praviśa kalyāṇāyārogyāya ceti, praviśya caināṃ piṇḍikāmadhiruhya pārśvāparapārśvābhyāṃ yathāsukhaṃ śayīthāḥ, na ca tvayā svedamūrcchāparītenāpi satā piṇḍikaiṣā vimoktavyā++āprāṇocchvāsāt, bhraśyamāno hyataḥ piṇḍivakāvakāśāddvāramanadhigacchan svedamūrcchāparītatayā sadyaḥ prāṇāñjahyāḥ, tasmāt piṇḍikāmenāṃ na kathaṃ cana muñcethāḥ; tvaṃ yadā jānīyāḥ --- vigatābhiṣyandamātmānaṃ samyakprasrutasvedapicchaṃ sarvasrotovimuktaṃ laghūbhūtamapagatavibandhastambhasuptivedanāgauravamiti, tatastāṃ piṇḍikāmanusaran dvāraṃ prapadyethāḥ, niṣkramya ca na sahasā cakṣuṣoḥ paripālanārthaṃ śītodakamupaspṛśethāḥ, apagatasantāpaklamastu muhūrtāt sukhoṣṇena vāriṇā yathānyāyaṃ pariṣikto 'aśnīyāḥ; iti jentākasvedaḥ//

Now, one wishing to construct a jentāka should examine the ground: in an auspicious, praiseworthy tract of land to the east or to the north, having black sweet soil or golden soil, on the southern or western bank of any water reservoir such as an enclosed lake or lotus pond, at an easily accessible bathing place, on an even, well-demarcated plot of ground, having stepped back seven or eight cubits from the water, one should construct a circular pavilion facing east or facing north, looking toward the bathing place, at most sixteen cubits in height and width, completely circular all around, finished with mud work, and with numerous windows. Inside this circular pavilion, all along the wall up to the door, one should construct a raised bench one cubit in width and height; and in the center of this circular pavilion, one should make a clay oven-column with many small holes and a lid, four cubits in measure, the height of a man, shaped like a roasting oven. One should fill it with wood of khadira or āśvakarṇa and ignite it. When he knows that the wood is well burned, free from smoke, and that the whole sweat house is thoroughly heated by the fire and endowed with heat suitable for sudation, then he should cause this person, whose body is anointed with vāta-alleviating substances and covered with a cloth, to enter, and should instruct him: “Gentle sir, enter for welfare and for health; having entered and climbed onto this bench, you should lie down comfortably, turning from one side to the other. Even if overtaken by fainting from the sweating, you must not abandon this bench until your life breath departs; for slipping down from the space of this bench and failing to find the door because you are overwhelmed by fainting from the sweating, you might instantly lose your life. Therefore, you must under no circumstances abandon this bench. When you perceive yourself free from moistness, your sticky sweat fully flowed out, freed in all channels, become light, and relieved of obstruction, stiffness, numbness, pain, and heaviness, then, feeling along that bench, you should proceed to the door; and having exited, you should not suddenly touch cold water, in order to protect your eyes. But after an hour, when heat and fatigue have departed, being sprinkled according to the proper method with comfortably warm water, you should eat.” This is jentākasveda.