Mbh 14.18.1a

"'"The Brahmana said, 'The acts, good and bad, that a Jiva does are not subject to destruction. Upon attainment of body after body, those acts produce fruits corresponding with them.[16] As a fruit-bearing tree, when the season comes of productivity, yields a large quantity of fruit, similarly merit, achieved with a pure heart, yields a large crop (of felicity). After the same fashion, sin, done with a sinful heart, produces a large crop of misery. The Soul (or Jiva), placing the mind ahead, addresses himself to action. Hear then how Jiva, equipt with all his acts and overwhelmed with lust and wrath, enters the womb. The vital seed, mixed with blood, enters the womb of females and becomes the field (of Jiva), good or bad, born of (his) acts. In consequence of his subtlety and the condition of being unmanifest, Jiva does not become attached to anything even after attaining to a body. Therefore, he is called Eternal Brahman.[17] That (viz., Jiva or Brahman) is the seed of all creatures. It is in consequence of Him that living creatures live. That Jiva, entering all the limbs of the foetus part by part, accepting the attribute of mind, and residing within all the regions that belong to Prana, supports (life). In consequence of this, the foetus becoming endued with mind begins to move its limbs.[18] As liquified iron, poured (into a mould), takes the form of the mould, know that the entrance of Jiva into the foetus is even such. As fire, entering a mass of iron, heats it greatly, do thou know that the manifestation of Jiva in the foetus is such. As a lamp, burning in a room, discovers (all things within it), after the same manner mind discovers the different limbs of the body.[19] Whatever acts, good or bad, Jiva does in a former body, have certainly to be enjoyed or endured by him.