Srimad-Bhagavatam: Canto 9 - Chapter 1 - Verse 50
Sanskrit:
अहो इमं पश्यत मे विनाशंतपस्विन: सच्चरितव्रतस्य ।अन्तर्जले वारिचरप्रसङ्गात्प्रच्यावितं ब्रह्म चिरं धृतं यत् ॥ ५० ॥
ITRANS:
aho imaṁ paśyata me vināśaṁtapasvinaḥ sac-carita-vratasyaantarjale vāri-cara-prasaṅgātpracyāvitaṁ brahma ciraṁ dhṛtaṁ yat
Translation:
Alas! While practicing austerity, even within the depths of the water, and while observing all the rules and regulations practiced by saintly persons, I lost the results of my long austerities simply by association with the sexual affairs of fish. Everyone should observe this falldown and learn from it.