Mahabharata 15.42.8

यावन्न क्षीयते कर्म तावदस्य स्वरूपतासंक्षीणकर्मा पुरुषो रूपान्यत्वं नियच्छति

yāvanna kṣīyate karma tāvadasya svarūpatāsaṃkṣīṇakarmā puruṣo rūpānyatvaṃ niyacchati

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