With Ambaṭṭha 2.8.1

2.8.1

“Evameva kho tvaṃ, ambaṭṭha, ye te ahesuṃ brāhmaṇānaṃ pubbakā isayo mantānaṃ kattāro mantānaṃ pavattāro, yesamidaṃ etarahi brāhmaṇā porāṇaṃ mantapadaṃ gītaṃ pavuttaṃ samihitaṃ, tadanugāyanti tadanubhāsanti bhāsitamanubhāsanti vācitamanuvācenti, seyyathidaṃ—aṭṭhako vāmako vāmadevo vessāmitto yamataggi aṅgīraso bhāradvājo vāseṭṭho kassapo bhagu:

“In the same way, Ambaṭṭha, the ancient seers of the brahmins were Aṭṭhaka, Vāmaka, Vāmadeva, Vessāmitta, Yamadaggi, Aṅgīrasa, Bhāradvāja, Vāseṭṭha, Kassapa, and Bhagu. They were the authors and propagators of the hymns. Their hymnal was sung and propagated and compiled in ancient times; and these days, brahmins continue to sing and chant it, chanting what was chanted and teaching what was taught.