Mahabharata 5.86.13

इदं तु सुमहत्कार्यं शृणु मे यत्समर्थितम्परायणं पाण्डवानां नियंस्यामि जनार्दनम्

idaṃ tu sumahatkāryaṃ śṛṇu me yatsamarthitamparāyaṇaṃ pāṇḍavānāṃ niyaṃsyāmi janārdanam

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