One verse

Srimad Bhagavatam 1.18.45

1.18.45

तदार्यधर्म: प्रविलीयते नृणां वर्णाश्रमाचारयुतस्त्रयीमय: । ततोऽर्थकामाभिनिवेशितात्मनां शुनां कपीनामिव वर्णसङ्कर: ॥ ४५ ॥

tadarya-dharmah praviliyate nrnam varnasramacara-yutas trayimayah tato ’rtha-kamabhinivesitatmanam sunam kapinam iva varna-sankarah

tada
at that time
arya
progressive civilization
dharmah
engagement
praviliyate
is systematically vanquished
nrnam
of humankind
varna
caste
asrama
orders of society
acara-yutah
composed in a good manner
trayi-mayah
in terms of the Vedic injunction
tatah
thereafter
artha
economic development
kama-abhinivesita
fully absorbed in sense gratification
atmanam
of men
sunam
like dogs
kapinam
like monkeys
iva
thus
varna-sankarah
unwanted population

At that time the people in general will fall systematically from the path of a progressive civilization in respect to the qualitative engagements of the castes and the orders of society and the Vedic injunctions. Thus they will be more attracted to economic development for sense gratification, and as a result there will be an unwanted population on the level of dogs and monkeys.