Mudgalapurana 3.37.37

3.37.37

uvāca taṃ mahābhāgaṃ bhārgavaṃ viṣṇumavyayam |
varaṃ vṛṇu mahābhāga bhaktyā dāsyāmi bhāvitaḥ ||

He said to that fortunate descendant of Bhṛgu, the imperishable Viṣṇu:
“Choose a boon, O fortunate one; moved by devotion, I shall grant it.”