2 Kings 6:18-20

18And they came down to him; and Elisha prayed to Jehovah and said, Smite this nation, I pray thee, with blindness. And he smote them with blindness according to the word of Elisha.

19And Elisha said to them, This is not the way, neither is this the city: follow me, and I will bring you to the man whom ye seek. And he led them to Samaria.

20And it came to pass when they entered into Samaria, that Elisha said, Jehovah, open the eyes of these [men] that they may see. And Jehovah opened their eyes, and they saw, and behold, they were in the midst of Samaria.