Valmiki Ramayana Yuddha Kanda Sarga 114 Shloka 11

घोरैः terrific, वानरैः Vanaras, महार्णवे great ocean, यदैव that time, सेतुः bridge, बद्धः constructed, तदैव at that time, अहम् I, रामम् Rama, अमानुषम् other than mortal, हृदयेन in my mind, शङ्के doubted

"When these terrific Vanaras constructed a bridge over the great ocean, I doubted in my mind at that time itself that Rama is not a mortal."