Valmiki Ramayana 6.111.4
यमस्मै प्रथमं प्रादादगस्त्यो भगवानृषिः ।ब्रह्मदत्तं महाबाणममोघं युधि वीर्यवान्॥
yamasmai prathamaṃ prādādagastyo bhagavānṛṣiḥ |brahmadattaṃ mahābāṇamamoghaṃ yudhi vīryavān ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book