Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 50
Sanskrit:
वर्णितं तदुपाख्यानं मया ते बहुविस्तरम् ।वैकुण्ठवासिनोर्जन्म विप्रशापात् पुन: पुन: ॥ ५० ॥
ITRANS:
varṇitaṁ tad upākhyānaṁmayā te bahu-vistaramvaikuṇṭha-vāsinor janmavipra-śāpāt punaḥ punaḥ
Translation:
I have already described to you in detail the history of the two residents of Vaikuṇṭha who had to undergo repeated births in the material world because of being cursed by brāhmaṇas.