2 Kings 6:17-20

And Elisha prayed, ‘Open his eyes, LORD, so that he may see.’ Then the LORD opened the servant’s eyes, and he looked and saw the hills full of horses and chariots of fire all round Elisha. As the enemy came down towards him, Elisha prayed to the LORD, ‘Strike this army with blindness.’ So he struck them with blindness, as Elisha had asked. Elisha told them, ‘This is not the road and this is not the city. Follow me, and I will lead you to the man you are looking for.’ And he led them to Samaria. After they entered the city, Elisha said, ‘LORD, open the eyes of these men so that they can see.’ Then the LORD opened their eyes and they looked, and there they were, inside Samaria.