Valmiki Ramayana Sundara Kanda Sarga 35 Shloka 49
Original Shlokaसहितौ रामसुग्रीवावुभावकुरुतां तदा। समयं वालिनं हन्तुं तव चान्वेषणं तथा।।5.35.49।।
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तदा then, रामसुग्रीवौ Rama and Sugriva, उभौ both, सहितौ together with, वालिनम् Vali, हन्तुम् to kill, तथा likewise, तव your, अन्वेषणम् search, समयम् agreement, अकुरुताम् reached.
"(Having become friends) Rama and Sugriva together reached an agreement to kill Vali and search for you.