Valmiki Ramayana Sundara Kanda Sarga 58 Shloka 1

ततः then, महाबलाः mighty, हनुमत्प्रमुखाः Hanuman the foremost, हरयः among vanaras, तस्य that, महेन्द्रस्यगिरेः on the mountain Mahendra, शृङ्गे summit, उत्तमाम् very much, प्रीतिम् rejoiced, जग्मुः went.

Then the mighty Hanuman and other vanaras having assembled on the summit of mountain Mahendra and felt vey much happy. Hanuman narrates all the incidents starting from his departure for Lanka till his return.