One verse

Srimad Bhagavatam 12.2.38

12.2.38

ताविहैत्य कलेरन्ते वासुदेवानुशिक्षितौ । वर्णाश्रमयुतं धर्मं पूर्ववत् प्रथयिष्यत: ॥ ३८ ॥

tāv ihaitya kaler ante vāsudevānuśikṣitau varṇāśrama-yutaṁ dharmaṁ pūrva-vat prathayiṣyataḥ

tau
they (Maru and Devāpi)
iha
to human society
etya
returning
kaleḥ
of the Age of Kali
ante
at the end
vāsudeva
by the Supreme Personality of Godhead, Vāsudeva
anuśikṣitau
instructed
varṇa-āśrama
the divine system of occupational and spiritual orders of society
yutam
comprising
dharmam
the code of eternal religion
pūrva-vat
just as previously
prathayiṣyataḥ
they will promulgate

At the end of the Age of Kali, these two kings, having received instruction directly from the Supreme Personality of Godhead, Vāsudeva, will return to human society and reestablish the eternal religion of man, characterized by the divisions of varṇa and āśrama, just as it was before.