Melachim Bais 6:16-17

And he answered, Fear not; for they that be with us are rabbim (many) more than they that be with them. And Elishah davened, and said, HASHEM, now, open his eyes, that he may see. And HASHEM opened the eyes of the na'ar and he saw; and, hinei, the har was full of susim and merkavot of eish all around Elishah.