One verse

Srimad Bhagavatam 12.3.29

12.3.29

यदा लोभस्त्वसन्तोषो मानो दम्भोऽथ मत्सर: । कर्मणां चापि काम्यानां द्वापरं तद् रजस्तम: ॥ २९ ॥

yadā lobhas tv asantoṣo māno dambho ’tha matsaraḥ karmaṇāṁ cāpi kāmyānāṁ dvāparaṁ tad rajas-tamaḥ

yadā
when
lobhaḥ
greed
tu
indeed
asantoṣaḥ
dissatisfaction
mānaḥ
false pride
dambhaḥ
hypocrisy
atha
and
matsaraḥ
envy
karmaṇām
of activities
ca
and
api
also
kāmyānām
selfish
dvāparam
the age of Dvāpara
tat
that
rajaḥ-tamaḥ
predominated by a mixture of the modes of passion and ignorance

When greed, dissatisfaction, false pride, hypocrisy and envy become prominent, along with attraction for selfish activities, such a time is the age of Dvāpara, dominated by the mixed modes of passion and ignorance.