Valmiki Ramayana Bala Kanda Sarga 76 Shloka 8
Original Shlokaन ह्ययं वैष्णवो दिव्य श्शर: परपुरञ्जय:। मोघ: पतति वीर्येण बलदर्पविनाशनः।।1.76.8।।
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परपुरञ्जय: conquering hostile cities, वीर्येण by prowess, बलदर्पविनाशन: destroyer of the pride and strength, दिव्य: celestial, अयम् this, वैष्णव: शर: arrow of Vishnu, मोघ: vain, न पतति हि shall not fall.
On conquering the hostile cities and destroying the pride and strength of the enemy by its prowess, this celestial arrow of Visnu shall not go in vain".