Mahabharata 7.53.14

तां न देवा न गन्धर्वा नासुरोरगराक्षसाःउत्सहन्तेऽन्यथा कर्तुं प्रतिज्ञां सव्यसाचिनः

tāṃ na devā na gandharvā nāsuroragarākṣasāḥutsahante'nyathā kartuṃ pratijñāṃ savyasācinaḥ

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