Valmiki Ramayana Yuddha Kanda Sarga 39 Shloka 16

महावेगाः capable of speed, ते they, महीम् great force, चरणपीडिताम् trampling down with feet, कुर्वन्तः doing, चरणोत्थितम् under feet, रजश्च dust, सहसैव in a second, ऊर्थ्वम् up to the sky, जगाम wentrose.

Those Vanaras endowed with speed went trampling down on the ground with force, the dust under their feet rose to the sky in a fraction of a second.