Mahabharata 13.112.65
श्वा ततो जायते मूढः कर्मणा तेन पार्थिवश्वा भूत्वा पञ्च वर्षाणि ततो जायति मानुषः
śvā tato jāyate mūḍhaḥ karmaṇā tena pārthivaśvā bhūtvā pañca varṣāṇi tato jāyati mānuṣaḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book