One verse

Srimad Bhagavatam 12.4.2

12.4.2

चतुर्युगसहस्रं तु ब्रह्मणो दिनमुच्यते । स कल्पो यत्र मनवश्चतुर्दश विशाम्पते ॥ २ ॥

catur-yuga-sahasraṁ tu brahmaṇo dinam ucyate sa kalpo yatra manavaś caturdaśa viśām-pate

catuḥ-yuga
four ages
sahasram
one thousand
tu
indeed
brahmaṇaḥ
of Lord Brahmā
dinam
the day
ucyate
is said
saḥ
that
kalpaḥ
a kalpa
yatra
in which
manavaḥ
original progenitors of mankind
caturdaśa
fourteen
viśām-pate
O King

One thousand cycles of four ages constitute a single day of Brahmā, known as a kalpa. In that period, O King, fourteen Manus come and go.