Mahabharata 5.139.57

समुपानय कौन्तेयं युद्धाय मम केशवमन्त्रसंवरणं कुर्वन्नित्यमेव परंतप

samupānaya kaunteyaṃ yuddhāya mama keśavamantrasaṃvaraṇaṃ kurvannityameva paraṃtapa

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