Valmiki Ramayana Kishkindha Kanda Sarga 23 Shloka 17
Original Shlokaउद्ववर्ह शरं नीलस्तस्य गात्रगतं तदा। गिरिगह्वरसंलीनं दीप्तमाशीविषं यथा4.23.17।।
1 source checked for this shloka
तदा then, नीलः Nila, तस्य his, गात्रगतम् deadbody, शरम् arrow, गिरिगह्वरसंलीनम् hidden in the mountain cave(heart), दीप्तम् glowing, आशीविषं यथा like a serpent, उद्ववर्ह made effort.
Then Nila took out the arrow from Vali's heart with due effort as one would pull out a glowing serpent hidden in the mountain cave.