Mahabharata 7.56.9

तत्कथं नु महाबाहुर्वासविः परवीरहाप्रतिज्ञां सफलां कुर्यादिति ते समचिन्तयन्

tatkathaṃ nu mahābāhurvāsaviḥ paravīrahāpratijñāṃ saphalāṃ kuryāditi te samacintayan

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