Valmiki Ramayana Yuddha Kanda Sarga 61 Shloka 29

असौवीरः This hero, एकेन alone, आह्ना mouth, बुभुक्षितः will consume, भूमिम् the earth, चरन् moving about, व्यात्तास्यः opening the mouth wide, सङ्कृद्धः like the swollen fire, पावकःइव like fire, लोकान् the world, भक्षयेत् will consume.

"This hero will open his mouth wide and move about and alone he will consume the world like the swollen fire."