But now I will not deal with the remnant of this people as in the former days, declares the Lord of hosts (Zechariah 8:11)
Zechariah is talking about the restoration of the people of Israel when God will bless them. The remnant are those faithful ones who will receive that blessing. In verse 13 it says Israel has been “a byword of cursing”, that is, famous for their sufferings. God is declaring through Zechariah that this will no longer be the case. Previously God allowed Israel to suffer at the hand of the nations because Israel was unfaithful. In the future God will bless the faithful remnant.