Mahabharata 3.219.36

कद्रूः सूक्ष्मवपुर्भूत्वा गर्भिणीं प्रविशेद्यदाभुङ्क्ते सा तत्र तं गर्भं सा तु नागं प्रसूयते

kadrūḥ sūkṣmavapurbhūtvā garbhiṇīṃ praviśedyadābhuṅkte sā tatra taṃ garbhaṃ sā tu nāgaṃ prasūyate

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