Narasimhapurana 64.12

64.12

dhyātvā yajñapatiṃ viṣṇuṃ samyag ārādhayan vibhum
tapassvādhyāyanirataḥ sākṣād brahmasuto yathā //

having meditated on Viṣṇu, the Lord of sacrifice, properly worshipping the omnipresent Lord, / devoted to ascetic penance and Vedic study, like a direct son of Brahmā;