etat te 'bhihitaṁ kṣattar
yan māṁ tvaṁ paripṛṣṭavān
pracetasāṁ nāradasya
saṁvādaṁ hari-kīrtanam
etat - this; te - unto you; abhihitam - instructed; kṣattaḥ - O Vidura; yat - whatever; mām - unto me; tvam - you; paripṛṣṭavān - inquired; pracetasām - of the Pracetās; nāradasya - of Nārada; saṁvādam - conversation; hari-kīrtanam - describing the glories of the Lord.
Śrīmad-Bhāgavatam describes the glories of the Lord and His devotees. Because the whole subject matter is the glorification of the Lord, naturally the glorification of His devotees automatically follows.