itihāsa-purāṇa-jñāḥ
itihāsa-purāṇa-jñāḥ smṛti-siddhānta-vedinaḥ |
vāsudeva-priyā ye ca tad-uktaṁ vaidikaṁ bhavet ||
(Padma Purāṇa; cited in Hari-bhakti-vilāsa: 12.416)
“The directive of one who is learned in the Itihāsas and Purāṇas, knowledgable in the siddhānta of the Smṛti, and dear to Vāsudeva shall be Vedic.”