Another fundamental tenet of Advaita Vedanta – indeed of all schools of philosophy in Hinduism – is that the sukshma sarira in which cidabhasa is always there survives the death of the sthoola sarira and is involved in transmigration from one world to another among the fourteen worlds (lokas) mentioned in Sastra and entry into different sthoola sariras in successive births (janmas). Associated with this tenet, there is the theory of karma. According to this, for the actions and thoughts ofjivatmas they incur what are called “punya” and “papa” (merit and demerit) and have to undergo enjoyment or suffering in future janmas and, sometimes in this janma itself.
Vide Brhadaranyaka Upanishad IV.4.vi – “Being attached, the (transmigrating jivatma) together with its karma attains that on which its subtle body or mind is set. It experiences (in the other world) the karma phalam (recompense for punya papa in the form of enjoyment and suffering) for whatever karma it had done in this world. When it is exhausted, it comes again from that world to this world for new karma. Thus does the man with craving (transmigrate)”.
Full Article: Advaita on Transmigration and Karma