Mudgalapurana 5.17.24

5.17.24

viṣṇuṃ jñātvā paraṃ bhāvaṃ tadarthaṃ saṃyataḥ svayam |
vaiṣṇavenaiva mārgeṇa toṣayāmāsa keśavam ||

Knowing Viṣṇu to be the supreme state, he self-controlledly directed himself to that end; / by the Vaiṣṇava path alone he pleased Keśava.