Mahabharata 12.183.16

इत्येतल्लोकनिर्माणं ब्रह्मणा विहितं पुराप्रजा विपरिवर्तन्ते स्वैः स्वैः कर्मभिरावृताः

ityetallokanirmāṇaṃ brahmaṇā vihitaṃ purāprajā viparivartante svaiḥ svaiḥ karmabhirāvṛtāḥ

Our plain-language meaning of this verse is waiting for scholar review.