Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 16
Sanskrit:
यासां पयोभि: कुशद्वीपौकस: कुशलकोविदाभियुक्तकुलकसंज्ञा भगवन्तं जातवेदसरूपिणं कर्मकौशलेन यजन्ते ॥ १६ ॥
ITRANS:
yāsāṁ payobhiḥ kuśadvīpaukasaḥ kuśala-kovidābhiyukta-kulaka-saṁjñā bhagavantaṁ jātaveda-sarūpiṇaṁ karma-kauśalena yajante.
Translation:
The inhabitants of the island of Kuśadvīpa are celebrated as the Kuśalas, Kovidas, Abhiyuktas and Kulakas. They are like the brāhmaṇas, kṣatriyas, vaiśyas and śūdras respectively. By bathing in the waters of those rivers, they all become purified. They are expert in performing ritualistic ceremonies according to the orders of the Vedic scriptures. Thus they worship the Lord in His aspect as the demigod of fire.