Mahabharata 5.178.16

इष्वस्त्रं मम बालस्य भवतैव चतुर्विधम्उपदिष्टं महाबाहो शिष्योऽस्मि तव भार्गव

iṣvastraṃ mama bālasya bhavataiva caturvidhamupadiṣṭaṃ mahābāho śiṣyo'smi tava bhārgava

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