Mahabharata 5.167.13

पृथगक्षौहिणीभ्यां तावुभौ संयति दारुणौसंबन्धिभावं रक्षन्तौ महत्कर्म करिष्यतः

pṛthagakṣauhiṇībhyāṃ tāvubhau saṃyati dāruṇausaṃbandhibhāvaṃ rakṣantau mahatkarma kariṣyataḥ

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