Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 5
निमित्तान्यत्यरिष्टानि काले त्वनुगते नृणाम् ।लोभाद्यधर्मप्रकृतिं दृष्ट्वोवाचानुजं नृप: ॥ ५ ॥
nimittāny atyariṣṭānikāle tv anugate nṛṇāmlobhādy-adharma-prakṛtiṁdṛṣṭvovācānujaṁ nṛpaḥ
In course of time it came to pass that people in general became accustomed to greed, anger, pride, etc. Mahārāja Yudhiṣṭhira, observing all these omens, spoke to his younger brother.
Such a pious king as Mahārāja Yudhiṣṭhira at once became perturbed when there were such inhuman symptoms as greed, anger, irreligiosity and hypocrisy rampant in society. It appears from this statement that all these symptoms of degraded society were unknown to the people of the time, and it was astonishing for them to have experienced them with the advent of the Kali-yuga, or the age of quarrel.