Zechariah 2:2-5 NIV

[2] I asked, “Where are you going?” He answered me, “To measure Jerusalem, to find out how wide and how long it is.” [3] While the angel who was speaking to me was leaving, another angel came to meet him [4] and said to him: “Run, tell that young man, ‘Jerusalem will be a city without walls because of the great number of people and animals in it. [5] And I myself will be a wall of fire around it,’ declares the LORD, ‘and I will be its glory within.’