bhavanti puruṣā loke
mad-bhaktās tvām anuvratāḥ
bhavān me khalu bhaktānāṁ
sarveṣāṁ pratirūpa-dhṛk
bhavanti - become; puruṣāḥ - persons; loke - in this world; mat-bhaktāḥ - My pure devotees; tvām - you; anuvratāḥ - following in your footsteps; bhavān - you; me - My; khalu - indeed; bhaktānām - of all devotees; sarveṣām - in different mellows; pratirūpa-dhṛk - tangible example.
In this connection, Śrīla Madhvācārya quotes a verse from the Skanda Purāṇa:
ṛte tu tāttvikān devān
nāradādīṁs tathaiva ca
prahrādād uttamaḥ ko nu
viṣṇu-bhaktau jagat-traye
There are many, many devotees of the Supreme Personality of Godhead, and they have been enumerated in Śrīmad-Bhāgavatam (6.3.20) as follows:
svayambhūr nāradaḥ śambhuḥ
kumāraḥ kapilo manuḥ
prahlādo janako bhīṣmo
balir vaiyāsakir vayam
Of the twelve authorized devotees — Lord Brahmā, Nārada, Lord Śiva, Kapila, Manu and so on — Prahlāda Mahārāja is understood to be the best example.