2Kgs 6:15

“his servant said unto him, Alas, my master! how shall we do?--When the Syrian detachment surrounded the place by night, for the apprehension of the prophet, his servant was paralyzed with fear. This was a new servant, who had only been with him since Gehazi's dismissal and consequently had little or no experience of his master's powers. His faith was easily shaken by so unexpected an alarm.”

“When Elisha's servant went out the next morning and saw the army, which had surrounded the town in the night, he said to the prophet, "Alas, my lord, how shall we do?" But Elisha quieted him, saying, "Fear not, for those with us are more than those with them." He then prayed that the Lord might open his servant's eyes, whereupon he saw the mountain upon which Dothan stood full of fiery horses and chariots round about Elisha. Opening the eyes was translation into the ecstatic state of clairvoyance, in which an insight into the invisible spirit-world was granted him. The fiery horses and chariots were symbols of the protecting powers of Heaven, which surrounded the prophet. The fiery form indicated the super-terrestrial origin of this host. Fire, as the most ethereal of all earthly elements, was the most appropriate substratum for making the spirit-world visible. The sight was based upon Jacob's vision (Gen 32:2), in which he saw a double army of angels encamped around him, at the time when he was threatened with danger from Esau.”