One verse

Srimad Bhagavatam 12.2.35

12.2.35

इत्येष मानवो वंशो यथा सङ्ख्यायते भुवि । तथा विट्‌शूद्रविप्राणां तास्ता ज्ञेया युगे युगे ॥ ३५ ॥

ity eṣa mānavo vaṁśo yathā saṅkhyāyate bhuvi tathā viṭ-śūdra-viprāṇāṁ tās tā jñeyā yuge yuge

iti
thus (in the cantos of this Śrīmad-Bhāgavatam)
eṣaḥ
this
mānavaḥ
descending from Vaivasvata Manu
vaṁśaḥ
the dynasty
yathā
as
saṅkhyāyate
it is enumerated
bhuvi
upon the earth
tathā
in the same way
viṭ
of the vaiśyas
śūdra
śūdras
viprāṇām
and brāhmaṇas
tāḥ tāḥ
the situations of each
jñeyāḥ
are to be understood
yuge yuge
in each age

Thus I have described the royal dynasty of Manu, as it is known on this earth. One can similarly study the history of the vaiśyas, śūdras and brāhmaṇas living in the various ages.