Valmiki Ramayana Sundara Kanda Sarga 39 Shloka 28

परवीरघ्न slayer of enemy heroes, अस्य कार्यस्य this task, परिसाधने to accomplish, त्वम् you, एक एव alone are, पर्याप्तः कामम् are competent, ते to you, फलोदयः fruit, यशस्यः of the accomplishment.

"O slayer of enemy heroes if you alone can accomplish this task the fame of doing this will be yours.