Mahabharata 3.220.9

रुद्रेणाग्निं समाविश्य स्वाहामाविश्य चोमयाहितार्थं सर्वलोकानां जातस्त्वमपराजितः

rudreṇāgniṃ samāviśya svāhāmāviśya comayāhitārthaṃ sarvalokānāṃ jātastvamaparājitaḥ

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