Mahabharata 7.69.65

ततो जघान समरे वृत्रं देवपतिः स्वयम्तं च मन्त्रमयं बन्धं वर्म चाङ्गिरसे ददौ

tato jaghāna samare vṛtraṃ devapatiḥ svayamtaṃ ca mantramayaṃ bandhaṃ varma cāṅgirase dadau

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