Mahabharata 5.143.10

कर्णार्जुनौ वै भवतां यथा रामजनार्दनौअसाध्यं किं नु लोके स्याद्युवयोः सहितात्मनोः

karṇārjunau vai bhavatāṃ yathā rāmajanārdanauasādhyaṃ kiṃ nu loke syādyuvayoḥ sahitātmanoḥ

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