John Gill Commentary Zechariah 8:21

"and the inhabitants of one [city] shall go to another, saying, Let us go speedily to entreat the favor of Jehovah, and to seek Jehovah of hosts: I will go also." — Zechariah 8:21 (ASV)

And the inhabitants of one [city] shall go to another , &c.] Which shows their concern for the spiritual welfare of each other, their zeal for the honour and glory of God, and their readiness to attend divine worship:

saying, Let us go speedily to pray before the Lord ; for pardoning, justifying, and sanctifying grace which shows their sense of need of these things, and that they are only to be had of the Lord; and that their case required haste, and would admit of no delay:

and to seek the Lord of hosts : by prayer and supplication, as before: the Chaldee paraphrase is, "to seek doctrine from the Lord of hosts"; to learn the truths of his Gospel; to know his will, and be informed of the right way of worshipping him, as well as to seek to Christ for life and salvation: I will go also ; that is, "this shall say to that", as the Targum supplies it; one shall say to another, and express himself in such language, by way of example and encouragement.