Śrīmad-Bhāgavatam · Text 5.20.27
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तद्वर्षपुरुषा ऋतव्रतसत्यव्रतदानव्रतानुव्रतनामानो भगवन्तं वाय्वात्मकं प्राणायामविधूतरजस्तमस: परमसमाधिना यजन्ते ॥ २७ ॥
tad-varṣa-puruṣā ṛtavrata-satyavrata-dānavratānuvrata-nāmāno bhagavantaṁ vāyv-ātmakaṁ prāṇāyāma-vidhūta-rajas-tamasaḥ parama-samādhinā yajante.
The inhabitants of those islands are also divided into four castes — Ṛtavrata, Satyavrata, Dānavrata and Anuvrata — which exactly resemble brāhmaṇa, kṣatriya, vaiśya and śūdra. They practice prāṇāyāma and mystic yoga, and in trance they worship the Supreme Lord in the form of Vāyu.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.