Mahabharata 14.18.9

लोहपिण्डं यथा वह्निः प्रविशत्यभितापयन्तथा त्वमपि जानीहि गर्भे जीवोपपादनम्

lohapiṇḍaṃ yathā vahniḥ praviśatyabhitāpayantathā tvamapi jānīhi garbhe jīvopapādanam

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