Skandapurana 5.222.10

5.222.10

kalāveva samākhyāto vyavahāraḥ prapā tadaḥ ..
alpasattvā yato lokāstena caiṣa vidhiḥ smṛtaḥ .. 6.223.10 ..

In the Kali age alone, conduct was declared to be a source of downfall. / Because people are of weak fortitude, this rule was remembered [for them].