Valmiki Ramayana Sundara Kanda Sarga 58 Shloka 135
Original Shlokaवसतो ऋश्यमूके मे पर्वते विपुलद्रुमे। राघवो रणविक्रान्तो मित्त्रत्वं समुपागतः।।5.58.135।।
1 source checked for this shloka
विपुलद्रुमे filled with plenty of trees, ऋश्यमूके Rshyamuka, वसतः dwelling, मे I, रणविक्रान्तः skilled in war, राघवः Rama, मित्त्रत्वम् friendship, उपागतः was made.
'While I was dwelling at the woodedmountain in Rshyamuka, a treaty of friendship was made with Rama, who is skilled in war.