One verse

Srimad Bhagavatam 5.20.27

5.20.27

तद्वर्षपुरुषा ऋतव्रतसत्यव्रतदानव्रतानुव्रतनामानो भगवन्तं वाय्वात्मकं प्राणायामविधूतरजस्तमस: परमसमाधिना यजन्ते ॥ २७ ॥

tad-varsa-purusa rtavrata-satyavrata-danavratanuvrata-namano bhagavantam vayv-atmakam pranayama-vidhuta-rajas-tamasah parama-samadhina yajante.

tat-varsa-purusah
the inhabitants of those tracts of land
rta-vrata
Rtavrata
satya-vrata
Satyavrata
dana-vrata
Danavrata
anuvrata
Anuvrata
namanah
having the four names
bhagavantam
the Supreme Personality of Godhead
vayu-atmakam
represented by the demigod Vayu
pranayama
by the practice of regulating the airs within the body
vidhuta
cleansed away
rajah-tamasah
whose passion and ignorance
parama
sublime
samadhina
by trance
yajante
they worship

The inhabitants of those islands are also divided into four castes—Rtavrata, Satyavrata, Danavrata and Anuvrata—which exactly resemble brahmana, ksatriya, vaisya and sudra. They practice pranayama and mystic yoga, and in trance they worship the Supreme Lord in the form of Vayu.