Mahabharata 12.310.25

ता एताद्यापि कृष्णस्य तपसा तेन दीपिताःअग्निवर्णा जटास्तात प्रकाशन्ते महात्मनः

tā etādyāpi kṛṣṇasya tapasā tena dīpitāḥagnivarṇā jaṭāstāta prakāśante mahātmanaḥ

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