Chapter 2 starts with a vision of a man with a measuring line who is going to measure how big the city of Jerusalem is. When the exiles return they will find a city with no walls, and that was not a good thing in the ancient world. Without walls a city had no defense, and surrounding nations would surely take advantage of that. We can read the interesting story of the rebuilding of the walls in Nehemiah, and how the situation was a precarious one. In this chapter we see a bit deeper into why they were able to succeed. The Lord was to be their wall until the physical one was finished.
5 And I myself will be a wall of fire around it,’ declares the Lord, ‘and I will be its glory within.’
No doubt this hearkens back to the pillar of fire that led Israel in the wilderness so long ago. Let their be no doubt in the people’s minds, God himself is their protection, even when they do build a wall. And the glory of God’s people is never their strength or wealth or popularity, or whatever, but God himself, his presence “within.” It is all of God, so that no one may boast.
Then we read the Lord imploring the people to come back from the places he has scattered them. No doubt the people after 70 years had gotten comfortable and used to the lands where they had settled. Plus the generation that had known the land of Israel and Jerusalem had died, so all they had was the oral tradition of what “the old country” was like. And I think we see an indication of the Trinity in these verses because the Lord himself will judge the nations that have plundered Israel:
8 For this is what the Lord Almighty says: “After the Glorious One has sent me against the nations that have plundered you—for whoever touches you touches the apple of his eye— 9 I will surely raise my hand against them so that their slaves will plunder them. Then you will know that the Lord Almighty has sent me.
The “Glorious One” and the Lord Almighty are the same person, while the one sent is the one above who himself will be the wall of fire above, and the city’s “glory within.” And the final verses of the chapter almost seem like a confusion of persons
10 “Shout and be glad, Daughter Zion. For I am coming, and I will live among you,” declares the Lord. 11 “Many nations will be joined with the Lord in that day and will become my people. I will live among you and you will know that the Lord Almighty has sent me to you. 12 The Lord will inherit Judah as his portion in the holy land and will again choose Jerusalem. 13 Be still before the Lord, all mankind, because he has roused himself from his holy dwelling.”
The Lord Almighty and the sent one are clearly both divine. There are two distinct persons, yet God has declared himself one. It would be into the fourth century AD before God’s people could get a grasp on exactly how this could be, but this text alone, among many others in the Old Testament show us that the concept of the Trinity is all over the Bible. We also see that in the day this happens we will witness the universality of the salvation God himself will provide. This story is way bigger than one people and one city. To this day billions of people call on the name of the Lord.