One verse

Srimad Bhagavatam 12.2.32

12.2.32

यदा मघाभ्यो यास्यन्ति पूर्वाषाढां महर्षय: । तदा नन्दात् प्रभृत्येष कलिर्वृद्धिं गमिष्यति ॥ ३२ ॥

yadā maghābhyo yāsyanti pūrvāṣāḍhāṁ maharṣayaḥ tadā nandāt prabhṛty eṣa kalir vṛddhiṁ gamiṣyati

yadā
when
maghābhyaḥ
from Maghā
yāsyanti
they will go
pūrva-āṣāḍhām
to the next lunar mansion, Pūrvāṣāḍhā
mahā-ṛṣayaḥ
the seven great sages
tadā
then
nandāt
beginning from Nanda
prabhṛti
and his descendants
eṣaḥ
this
kaliḥ
Age of Kali
vṛddhim
maturity
gamiṣyati
will attain

When the great sages of the Saptarṣi constellation pass from Maghā to Pūrvāsāḍhā, Kali will have his full strength, beginning from King Nanda and his dynasty.