Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 3
Sanskrit:
पितरि भ्रंशिते स्थानादिन्द्राण्या धर्षणाद्द्विजै: ।प्रापितेऽजगरत्वं वै ययातिरभवन्नृप: ॥ ३ ॥
ITRANS:
pitari bhraṁśite sthānādindrāṇyā dharṣaṇād dvijaiḥprāpite ’jagaratvaṁ vaiyayātir abhavan nṛpaḥ
Translation:
Because Nahuṣa, the father of Yayāti, molested Indra’s wife, Śacī, who then complained to Agastya and other brāhmaṇas, these saintly brāhmaṇas cursed Nahuṣa to fall from the heavenly planets and be degraded to the status of a python. Consequently, Yayāti became the king.