Zechariah 2:6

3 And the Lord gave me a vision of four metal-workers.

4 Then I said, What have these come to do? And he said, These are the horns which sent Judah in flight, and kept him from lifting up his head: but these men have come to send fear on them and to put down the nations who are lifting up their horns against the land of Judah to send it in flight.

5 And lifting up my eyes, I saw a man with a measuring-line in his hand.

6 And I said to him, Where are you going? And he said to me, To take the measure of Jerusalem, to see how wide and how long it is.

7 And the angel who was talking to me went out, and another angel went out, and, meeting him,

8 Said to him, Go quickly and say to this young man, Jerusalem will be an unwalled town, because of the great number of men and cattle in her.

9 For I, says the Lord, will be a wall of fire round about her, and I will be the glory inside her.