Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 3

Sanskrit:

द्वैपायनादनवरो महित्वे तस्य देहज: ।सर्वात्मना श्रित: कृष्णं तत्परांश्चाप्यनुव्रत: ॥ ३ ॥

ITRANS:

dvaipāyanād anavaromahitve tasya dehajaḥsarvātmanā śritaḥ kṛṣṇaṁtat-parāṁś cāpy anuvrataḥ

Translation:

Vidura was born from the body of Vedavyāsa and was not less than he. Thus he accepted the lotus feet of Kṛṣṇa wholeheartedly and was attached to His devotees.

Purport:

The history of Vidura is that he was born of a śūdra mother, but his seminal father was Vyāsadeva; thus he was not less than Vyāsadeva in any respect. Since he was born of a great father, who was supposed to be an incarnation of Nārāyaṇa and who composed all the Vedic literatures, Vidura was also a great personality. He accepted Kṛṣṇa as his worshipable Lord and followed His instructions wholeheartedly.