The nation of Israel, the Jews, the twelve tribes of Israel. Read Romans 11 and Galatians 3:28.
Okay, thanks.
GL 3:28 teaches that Christians are spiritual Jews.
RM 11:7 teaches that most physical Jews were/are not saved/elect.
In 11:11-14 Paul hopes that salvation coming to Gentiles will prompt Jews to believe.
11:17-22 teaches that Jews are rejected because of unbelief, and Gentiles need to learn to persevere in saving faith.
11:23-24 says that Jews who repent will be saved.
11:25-32 indicates that all Jews who are alive at some time will repent before the end.
11:33-36 praises God.
You said: "The Jews have been set aside right now during the church age... They will become a people again in the last days."
IMO, Jews who reject Christ are lopped off or set aside, and all Jews living in the last days will become Christians.