Valmiki Ramayana Sundara Kanda Sarga 3 Shloka 30
Original Shlokaअहं हि नगरी लङ्का स्वयमेव प्लवङ्गम। सर्वतः परिरक्षामि ह्येतत्ते कथितं मया।।5.3.30।।
1 source checked for this shloka
प्लवङ्गम monkey, अहम् I, स्वयम् myself, लङ्कानगरी city of Lanka, सर्वतः all over, परिरक्षामि I will be protecting, एतत् as such, ते to you, मया by me, कथितं हि is told.
"O monkey I am the presiding ogress of Lanka presenting myself personally. I am to protect this city. This is my answer to you".