Mahabharata 3.240.38

अथ वा ते भयं जातं दृष्ट्वार्जुनपराक्रमम्सत्यं ते प्रतिजानामि वधिष्यामि रणेऽर्जुनम्

atha vā te bhayaṃ jātaṃ dṛṣṭvārjunaparākramamsatyaṃ te pratijānāmi vadhiṣyāmi raṇe'rjunam

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