Bhagavatapurana 11.3.22

11.3.22

tatra bhāgavatān dharmān śikṣed gurv-ātma-daivataḥ /
amāyayānuvṛttyā yais tuṣyed ātmātma-do hariḥ //

22. Under the preceptor he should learn and practise sincerely and obediently the virtue of His votaries with the belief that the preceptor is Atman and the deity, by which Hari, the Paramatman and the giver of self-realisation, may be pleased.