Mahabharata 3.165.14

अभेद्यं कवचं चेदं स्पर्शरूपवदुत्तमम्अजरां ज्यामिमां चापि गाण्डीवे समयोजयत्

abhedyaṃ kavacaṃ cedaṃ sparśarūpavaduttamamajarāṃ jyāmimāṃ cāpi gāṇḍīve samayojayat

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