Somavaṃśa-prasavaḥ
Birth of the Lunar Line: Budha–Purūravas and the Urvaśī Episode
तमुग्रतपसं दृष्ट्वा सहस्राक्षः पुरन्दरः / समर्थः पुत्रजनने स्वयमेवास्य शाश्वतः
tamugratapasaṃ dṛṣṭvā sahasrākṣaḥ purandaraḥ / samarthaḥ putrajanane svayamevāsya śāśvataḥ
Beholding that fierce austerity, Sahasrākṣa Purandara (Indra) resolved that he himself—the Eternal—was able to be born as his son.