Bhagavatapurana 10.80.32

10.80.32

sa vai sat-karmaṇāṃ sākṣād dvijāter iha sambhavaḥ /
ādyo 'ṅga yatrāśramiṇāṃ yathāhaṃ jñāna-do guruḥ //

32. To one in samsara he is the first of fathers from whom a brahmin by birth obtains a knowledge of the Vedas and the righteous course of duties and so the more worthy of worship, dear Sudaman, just as I am, as bestowing the knowledge of Truth to all the four orders of life.