One verse

Srimad Bhagavatam 8.14.11

8.14.11

एतत् कल्पविकल्पस्य प्रमाणं परिकीर्तितम् । यत्र मन्वन्तराण्याहुश्चतुर्दश पुराविद: ॥ ११ ॥

etat kalpa-vikalpasya pramanam parikirtitam yatra manvantarany ahus caturdasa puravidah

etat
all these
kalpa
in one day of Lord Brahma
vikalpasya
of the changes in a kalpa, such as the change of Manus
pramanam
evidences
parikirtitam
described (by me)
yatra
wherein
manvantarani
periods of Manu
ahuh
said
caturdasa
fourteen
pura-vidah
learned scholars.

In one kalpa, or one day of Brahma, there take place the many changes called vikalpas. O King, all of these have been previously described to you by me. Learned scholars who know the past, present and future have ascertained that in one day of Brahma there are fourteen Manus.