Mahabharata Aswamedha Parva Chapter 17:3

Mahabharata Aswamedha Parva (Anugita Parva) Chapter 17:3 Even as men possessed of eyes behold the fire-fly appearing and disappearing amid darkness, men possessed of the eye of knowledge and crowned with success of penances, behold, with spiritual vision, Jiva as he leaves the body, as he is reborn, and as he enters the womb. It is seen that Jiva has three regions assigned to him eternally. This world where creatures dwell is called the field of action. Accomplishing acts good or bad, all embodied creatures attain to the fruits thereof. In consequence of their own acts, creatures acquire even here superior or inferior enjoyments. Doers of evil deeds here, in consequence of those acts of theirs, attain to Hell. This condition of sinking with head downwards, in which creatures are cooked, is one of great misery. It is such that a rescue therefrom is exceedingly difficult. Indeed, one should strive hard for saving oneself from this misery. Those regions where creatures dwell when they ascend from this world I shall now declare truly. Do thou listen to me with attention. By listening to what I say, thou shalt attain to firmness of understanding and a clear apprehension of (good and bad) acts. Know that even those are the regions of all creatures of righteous deeds, viz., the stellar worlds that shine in the firmament, the lunar disc, and the solar disc as well that shines in the universe in its own light. Upon the exhaustion, again, of their merits, they fall away from those regions repeatedly. There, in Heaven itself, is distinction of inferior, superior, and middling felicity. There, in Heaven itself, is discontent at sight of prosperity more blazing than one's own. Even these are the goals which I have mentioned in detail. I shall, after this, discourse to you on the attainment by Jiva of the condition of residence in the womb. Do thou hear me, with concentrated attention, O regenerate one, as I speak to thee!'