Valmiki Ramayana Aranya Kanda Sarga 5 Shloka 2

इदम् this, दुर्गम् wild, वनम् forest, कष्टम् is difficult, वनगोचराः uracquainted, न च स्मः we are not, शीघ्रम् quickly, तपोधनम् to the sage, शरभङ्गम् Sarabhanga, अभिगच्छामहे we shall go.

This wild forest with which we have not been acquainted earlier is difficult to pass. (Hence) let us proceed quickly to sage Sarabhanga.