Valmiki Ramayana Yuddha Kanda Sarga 48 Shloka 30
Original Shlokaनेमौशक्यारणेजेतुंसेन्द्रैरपिसुरासुरैः । तादृशंदर्शनंदृष्टवामयाचावेदितंतव ।।6.48.30।।
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इमौ these, सेन्द्रैः Indra, सुरासुरैरपि even Suras or Asuras also, रणे in war, जेतुम् to win, नशक्यौ not capable, तादृशम् indications of life, दर्शनम् observation, दृष्टवा seeing, मया by me, तव your, आवेदितुम् making you to know.
"These two are not capable of being won in war even by gods or demons. On observation of the indications by me I am making you realize."