Somavaṃśa-prasavaḥ
Birth of the Lunar Line: Budha–Purūravas and the Urvaśī Episode
विश्वामित्रं तु दायादं गाधिः कुशिकनन्दनः / प्राप्य ब्रह्मर्षिसमतां जगाम ब्रह्मणा वृतः ६६।५८// सा हि सत्यवती पुण्या सत्यव्रतपरायणा / कौशिकी तु समाख्याता प्रवृत्तेयं महानदी
viśvāmitraṃ tu dāyādaṃ gādhiḥ kuśikanandanaḥ / prāpya brahmarṣisamatāṃ jagāma brahmaṇā vṛtaḥ 66.58// sā hi satyavatī puṇyā satyavrataparāyaṇā / kauśikī tu samākhyātā pravṛtteyaṃ mahānadī
Gādhi, son of Kuśika, having obtained Viśvāmitra as his heir, attained the rank of a Brahmarṣi and, encompassed by Brahmā’s grace, went to the supreme state. That holy Satyavatī, steadfast in the vow of truth, became known as Kauśikī, and from her this great river came forth.