Those who are left in Zion, who remain in Jerusalem, will be called holy, all who are recorded among the living in Jerusalem.

In the previous chapter we hear a scathing doom and gloom prophecy against Judah and Jerusalem.  In Israel, however, there is a remnant, survivors, those whom God will call holy.  Because of them, He will provide protection and a shelter.  We want to be part of the remnant, those who love God and honor Him in a society that seems to be going the other direction