Skanda Purana 5.18.29

5.18.29

.. rājovāca .. ..
kena karmavipākena pretatvaṃ jāyate nṛṇām..
etanme sarvamācakṣva māṃsāda mama pṛcchataḥ ..29..

The king said: / “By what ripening of karma does the state of a ghost arise for men? / Tell me all of this, Māṃsāda, as I ask you.”