Valmiki Ramayana Bala Kanda Sarga 75 Shloka 3
Original Shlokaतदिदं घोरसङ्काशं जामदग्न्यं महद्धनु:। पूरयस्व शरेणैव स्वबलं दर्शयस्व च।।1.75.3।।
1 source checked for this shloka
घोरसङ्काशं appearing dreadful, जामदग्न्यम् obtained through Jamadagni, तत् that, इदम् this, महत् mighty, धनु: bow, शरेणैव with arrow, पूरयस्व fill it, स्वबलम् your own prowess, दर्शयस्व show.
This mighty, dreadful bow was obtained through Jamadagni. You may display your prowess by fixing on it an arrow.