Mahabharata 13.126.16

ततो नारायणं तेजो व्रतचर्येन्धनोत्थितम्वक्त्रान्निःसृत्य कृष्णस्य वह्निरद्भुतकर्मणः

tato nārāyaṇaṃ tejo vratacaryendhanotthitamvaktrānniḥsṛtya kṛṣṇasya vahniradbhutakarmaṇaḥ

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