Śāṇḍilya Upaniṣad 1.5_2

1.5_2

yamaniyamayutaḥ puruṣaḥ sarvasaṅgavivarjitaḥ kṛtavidyaḥ satyadharmarato jitakrodho guruśuśrūṣānirataḥ pitṛmātṛvidheyaḥ svāśramoktasadācāravidvacchikṣitaḥ phalamūlodakānvitaṃ tapovanaṃ prāpya ramyadeśe brahmaghoṣasamanvite svadharmaniratabrahmavitsamāvṛte phalamūlapuṣpavāribhiḥ susampūrṇe devāyatane nadītīre grāme nagare vāpi suśobhanamaṭhaṃ nātyuccanīcāyatamalpadvāraṃ gomayādiliptaṃ sarvarakṣāsamanvitaṃ kṛtvā tatra vedāntaśravaṇaṃ kurvanyogaṃ samārabhet | ādau vināyakaṃ sampūjya sveṣṭadevatāṃ natvā pūrvoktāsane sthitvā prāṅmukha udaṅmukho vāpi mṛdvāsaneṣu jitāsanagato vidvānsamagrīvaśironāsāgradṛgbhrūmadhye śaśabhṛdbiṃbaṃ paśyannetrābhyāmamṛtaṃ pibet | dvādaśamātrayā iḍayā vāyumāpūryodare sthitaṃ jvālāvalīyutaṃ rephabinduyuktamagnimaṇḍalayutaṃ dhyāyedrecayetpiṅgalayā | punaḥ piṅgalayāpūrya kumbhitvā recayediḍayā | tricatustricatuḥsaptatricāturmāsaparyantaṃ trisandhiṣu tadantarāleṣu ca ṣaṭkṛtva ācarennāḍīśuddhirbhavati | tataḥ śarīre laghudīptivahnivṛddhinādābhivyaktirbhavati ||

"Having thus acquired a thorough knowledge of the seat of the nādis and of the vāyus with their functions, one should begin with the purification of the nādis. A person possessed of yama and niyama, avoiding all company, having finished his course of study, delighting in truth and virtue, having conquered (his) anger, being engaged in the service of his spiritual instructor and having been obedient to his parents and well instructed in all the religious practices and the knowledge of his order of life, should go to a sacred grove abounding in fruits, roots, and water. There he should select a pleasant spot always resounding with the chanting of the Veḍas, frequented by the knowers of Brahman that persevere in the duties of their orders of life and filled with fruits, roots, flowers, and water. (Else) either in a temple or on the banks of a river or in a village or in a town, he should build a beautiful monastery. It should be neither too long nor too high, should have a small door, should be besmeared well with cow-dung and should have every sort of protection. There listening to the exposition of veḍānṭa, he should begin to practise yoga, In the beginning having worshipped Vināyaka (Gaṇeśa), he should salute his Ishta-Ḍevaṭā (tutelary deity) and sitting in any of the above-mentioned postures on a soft seat, facing either the east or the north and having conquered them, the learned man keeping his head and neck erect and fixing his gaze on the tip of his nose, should see the sphere of the moon between his eyebrows and drink the nectar (flowing therefrom through his eyes. Inhaling the air through Idā for the space of twelve māṭrās, he should contemplate on the sphere of fire situated in the belly as surrounded with flames and having as its seed र (ra); then he should exhale it through Piṅgalā. Again inhaling it through Piṅgalā and retaining it (within), he should exhale it through Idā. For the period of twenty-eight months, he should practise six times at every sitting through the three sanḍhyās (morning, noon, and evening)

and during the intervals. By this, the nādis become purified. Then the body becomes light and bright, the (gastric) fire is increased (within) and there is the manifestation of nāḍa (internal sound).