Mahabharata 8.30.53

तत्रैव ब्राह्मणो भूत्वा ततो भवति क्षत्रियःवैश्यः शूद्रश्च बाह्लीकस्ततो भवति नापितः

tatraiva brāhmaṇo bhūtvā tato bhavati kṣatriyaḥvaiśyaḥ śūdraśca bāhlīkastato bhavati nāpitaḥ

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