Valmiki Ramayana Sundara Kanda Sarga 58 Shloka 13

पुत्त्र O son, पुरा in the past, पर्वतोत्तमाः the foremost of mountains, पक्षवन्तः had wings, बभूवुः had, बाधमानाः tormenting, छन्दतः at will, समन्ततः all over, पृथिवीम् the earth, चेरुः ranging.

'O son in the past, foremost of the mountains too had wings and they used to range at will all over the earth tormenting all.