2:1-5 The Son of David, even the Man Christ Jesus, whom the prophet sees with a measuring line in his hand, is the Master-Builder of his church. God notices the extent of his church, and will take care that whatever number of guests are brought to the wedding-supper, there shall be room. This vision means well to Jerusalem. The walls of a city, as they defend it, so they straiten its inhabitants; but Jerusalem shall be extended as freely as if it had no walls at all, yet shall be as safe as if it had the strongest walls. In the church of God there yet is room for other multitudes, more than man can number. None shall be refused who trust in Christ; and He never shuts out from heaven one true member of the church on earth. God will be a Wall of fire round them, which can neither be broken through nor undermined, nor can it be assailed without danger to those who attack. This vision was to have its full accomplishment in the gospel church, which is extended by admitting the Gentiles into it; and which has the Son of God for its Prince and Protector; especially in the glorious times yet to come.
4. this young man—So Zechariah is called as being still a youth when prophetically inspired [Grotius]. Or, he is so called in respect to his ministry or service (compare Nu 11:27; Jos 1:1) [Vatablus]. Naturally the "angel that talked with" Zechariah is desired to "speak to" him the further communications to be made from the Divine Being.
towns without walls for the multitude … Cattle—So many shall be its inhabitants that all could not be contained within the walls, but shall spread out in the open country around (Es 9:19); and so secure shall they be as not to need to shelter themselves and their cattle behind walls. So hereafter Judea is to be "the land of unwalled villages" (Eze 38:11). Spiritually, now the Church has extended herself beyond the walls (Eph 2:14, 15) of Mosaic ordinances and has spread from cities to country villages, whose inhabitants gave their Latin name (pagani) to pagans, as being the last in parting with heathenism.