Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 24
Sanskrit:
रम्यके च भगवत: प्रियतमं मात्स्यमवताररूपं तद्वर्षपुरुषस्य मनो: प्राक्प्रदर्शितं स इदानीमपि महता भक्तियोगेनाराधयतीदं चोदाहरति ॥ २४ ॥
ITRANS:
ramyake ca bhagavataḥ priyatamaṁ mātsyam avatāra-rūpaṁ tad-varṣa-puruṣasya manoḥ prāk-pradarśitaṁ sa idānīm api mahatā bhakti-yogenārādhayatīdaṁ codāharati.
Translation:
Śukadeva Gosvāmī continued: In Ramyaka-varṣa, where Vaivasvata Manu rules, the Supreme Personality of Godhead appeared as Lord Matsya at the end of the last era [the Cākṣuṣa-manvantara]. Vaivasvata Manu now worships Lord Matsya in pure devotional service and chants the following mantra.