Ramayana
नारायणगिरिं ते तु गर्जन्तो राक्षसाम्बुदाः । ववर्षुः शरवर्षेण वर्षेणेवाद्रिमम्बुदाः ॥ 7-7-1 ॥
Roaring, those Rakshasas, like rain-clouds, poured down a torrent of arrows upon the mountain that was Narayana, as storm-clouds pour rain upon a mountain.
english translation