If we accept this promise as in the smallest degree referring to the building of the second temple and the city, after the people's return from Babylon, we must still look further to gospel days, to observe the full accomplishment of it: for there we find holiness indeed unto the Lord, in Jesus the glorious Head of his church, so as the church must be preserved in him forever.
Related Commentaries of Jeremiah 31:38
Jeremiah 31:38-40
38 Behold, the days come, saith the LORD, that the city shall be built to the LORD from the tower of Hananeel unto the gate of the corner.
39 And the measuring line shall yet go forth over against it upon the hill Gareb, and shall compass about to Goath.
40 And the whole valley of the dead bodies, and of the ashes, and all the fields unto the brook of Kidron, unto the corner of the horse gate toward the east, shall be holy unto the LORD; it shall not be plucked up, nor thrown down any more for ever.