Devibhagavatapurana 4.17.21

4.17.21

iti stutvā prasannātmā babhūva surarāṭ tataḥ |
nārāyaṇo'pi dharmātmā tapasyabhirato'bhavat ||

The Lord of the Devas thus extolled his merits and became freed from his anxieties. The virtuous Nârâyana, too, devoted himself to the practice of his Tapasyâ.