Bhagavatapurana 2.10.50

2.10.50

brūhi nastadidaṃ saumya vidurasya viceṣṭitam /
bandhutyāganimittaṃ ca yathaivāgatavān punaḥ //

49 and 50. At what place he met *Kausharava* (Maitreya) and heard his discourse upon Atman (on Adhyatma subjects), what philosophical questions that worshipful sage was asked and what he explained to Vidura, please tell us, O gentle one, all about it, and also of all that Vidura did, why he abandoned his relations and why he came back."