Mahabharata 7.170.4

ततो वेगेन महता विनद्य स नरर्षभःप्रतिज्ञां श्रावयामास पुनरेव तवात्मजम्

tato vegena mahatā vinadya sa nararṣabhaḥpratijñāṃ śrāvayāmāsa punareva tavātmajam

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