Mbh 3.189.3a

“Thus addressed, that foremost of Munis began his discourse again, delighting that tiger of the Vrishni race and the sons of Pandu as well. And Markandeya said, ‘Listen, O monarch, to all that hath been seen and heard by me, and to all, O king of kings, that hath been known to me by intuition from the grace of the God of gods! O bull of the Bharata race, listen to me as I narrate the future history of the world during the sinful age. O bull of the Bharata race, in the Krita age, everything was free from deceit and guile and avarice and covetousness; and morality like a bull was among men, with all the four legs complete. In the Treta age sin took away one of these legs and morality had three legs. In the Dwapara, sin and morality are mixed half and half; and accordingly morality is said to have two legs only. In the dark age (of Kali), O thou best of the Bharata race, morality mixed with three parts of sin liveth by the side of men. Accordingly morality then is said to wait on men, with only a fourth part of itself remaining. Know, O Yudhishthira, that the period of life, the energy, intellect and the physical strength of men decrease in every Yuga! O Pandava, the Brahmanas and Kshatriyas and Vaisyas and Sudras, (in the Kali age) will practise morality and virtue deceitfully and men in general will deceive their fellows by spreading the net of virtue. And men with false reputation of learning will, by their acts, cause Truth to be contracted and concealed. And in consequence of the shortness of their lives they will not be able to acquire much knowledge. And in consequence of the littleness of their knowledge, they will have no wisdom. And for this, covetousness and avarice will overwhelm them all. And wedded to avarice and wrath and ignorance and lust men will entertain animosities towards one another, desiring to take one another’s lives.