Zechariah 2:2-5

2And I said, Whither goest thou? And he said unto me, To measure Jerusalem, to see what is the breadth thereof, and what is the length thereof.

3And behold, the angel that talked with me went forth; and another angel went forth to meet him,

4and said unto him, Run, speak to this young man, saying, Jerusalem shall be inhabited as towns without walls for the multitude of men and cattle therein;

5and I, saith Jehovah, I will be unto her a wall of fire round about, and will be the glory in the midst of her.