One verse

Srimad Bhagavatam 1.3.25

1.3.25

अथासौ युगसन्ध्यायां दस्युप्रायेषु राजसु । जनिता विष्णुयशसो नाम्ना कल्किर्जगत्पति: ॥ २५ ॥

athasau yuga-sandhyayam dasyu-prayesu rajasu janita visnu-yasaso namna kalkir jagat-patih

atha
thereafter
asau
the same Lord
yuga-sandhyayam
at the conjunction of the yugas
dasyu
plunderers
prayesu
almost all
rajasu
the governing personalities
janita
will take His birth
visnu
named Visnu
yasasah
surnamed Yasa
namna
in the name of
kalkih
the incarnation of the Lord
jagat-patih
the Lord of the creation.

Thereafter, at the conjunction of two yugas, the Lord of the creation will take His birth as the Kalki incarnation and become the son of Visnu Yasa. At this time the rulers of the earth will have degenerated into plunderers.