Mahabharata Aswamedha Parva Chapter 36:2

Mahabharata Aswamedha Parva (Anugita Parva) Chapter 36:2 Whatever men there are in this world who are characterised by these and other faults of a similar kind, and who break through the restraints (provided by the scriptures), are all regarded as belonging to the quality of Darkness. I shall now declare the wombs where these men, who are always of sinful deeds, have to take their birth. Ordained to go to hell, they sink in the order of being. Indeed, they sink into the hell of (birth in) the brute creation. They become immobile entities, or animals, or beasts of burden; or carnivorous creatures, or snakes, or worms, insects, and birds; or creatures of the oviparous order, or quadrupeds of diverse species; or lunatics, or deaf or dumb human beings, or men that are afflicted by dreadful maladies and regarded as unclean. These men of evil conduct, always exhibiting the indications of their acts, sink in Darkness. Their course (of migrations) is always downwards. Appertaining to the quality of Darkness, they sink in Darkness. I shall, after this, declare what the means are of their improvement and ascent; indeed, by what means they succeed in attaining to the regions that exist for men of pious deeds. Those men who take birth in orders other than humanity, by growing up in view of the religious ceremonies of Brahmanas devoted to the duties of their own order and desirous of doing good to all creatures, succeed, through the aid of such purificatory rites, in ascending upwards. Indeed, struggling (to improve themselves), they at last attain to the same regions with these pious Brahmanas. Verily, they go to Heaven. Even this is the Vedic audition. Born in orders other than humanity and growing old in their respective acts, even thus they become human beings that are, of course, ordained to return. Coming to sinful births and becoming Chandalas or human beings that are deaf or that lisp indistinctly, they attain to higher and higher castes, one after another in proper turn, transcending the Sudra order, and other (consequences of) qualities that appertain to Darkness and that abide in it in course of migrations in this world. Attachment to objects of desire is regarded as great delusion. Here Rishis and Munis and deities become deluded, desirous of pleasure. Darkness, delusion, the great delusion, the great obscurity called wrath, and death, that blinding obscurity, (these are the five great afflictions). As regards wrath, that is the great obscurity (and not aversion or hatred as is sometimes included in the list). With respect then to its colour (nature), its characteristics, and its source, I have, ye learned Brahmanas, declared to you, accurately and in due order, everything about (the quality of) Darkness. Who is there that truly understands it? Who is there that truly sees it? That, indeed, is the characteristic of Darkness, viz., the beholding of reality in what is not real. The qualities of Darkness have been declared to you in various ways. Duly has Darkness, in its higher and lower forms, been described to you. That man who always bears in mind the qualities mentioned here, will surely succeed in becoming freed from all characteristics that appertain to Darkness.