SB 10.45.33

tayor dvija-varas tuṣṭaḥ
 śuddha-bhāvānuvṛttibhiḥ
provāca vedān akhilān
 sāṅgopaniṣado guruḥ
Synonyms: 
tayoḥ — Their; dvija-varaḥ — the best of brāhmaṇas (Sāndīpani); tuṣṭaḥ — satisfied; śuddha — pure; bhāva — with love; anuvṛttibhiḥ — by the submissive acts; provāca — he spoke; vedān — the Vedas; akhilān — all; sa — together with; aṅga — the (six) corollary literatures; upaniṣadaḥ — and the Upaniṣads; guruḥ — the spiritual master.
Translation: 
That best of brāhmaṇas, the spiritual master Sāndīpani, was satisfied with Their submissive behavior, and thus he taught Them the entire Vedas, together with their six corollaries and the Upaniṣads.