Valmiki Ramayana Yuddha Kanda Sarga 74 Shloka 53

पितृतुल्यवेगः like his father in speed, सः he, पर्वतान् mountains, वृक्षगवान् trees, सरांसि birds, नदीः rivers, तटाकानि tanks, पुरोत्तमानि best of cities, तान् them, स्फीतान् prosperous, जनान्तान् अपि people, सम्प्रवीक्ष्य watching, वेगात् speedily, जगाम went.

Watching the mountains, trees, birds, rivers, tanks, the best of cities, all of them and prosperous people, he went at his father's speed.