Valmiki Ramayana Sundara Kanda Sarga 30 Shloka 4
Original Shlokaचारेण तु सुयुक्तेन शत्रोश्शक्तिमवेक्षता। गूढेन चरता तावदवेक्षितमिदं मया।।5.30.4।।
1 source checked for this shloka
सुयुक्तेन very carefully, शत्रोः enemy's, शक्तिमवेक्षता while seeing the strength, गूढेन in disguise, चरता roaming, चारेण a spy, मया by myself, इदम् this place, अवेक्षितं तावत् seen everything.
"Roaming everywhere incognito to ascertain carefully the strength of the enemy, I have seen everything.