What happens to Israel's sins when the Abrahamic covenant is fulfilled?
At the full fruition of the Abrahamic covenant, God will forgive Israel's iniquity and remember their sin no more. The Messiah will be their King, every Jew in the kingdom will be a believer, and they will enjoy the whole Middle East as their homeland.
Les teaches that although Israel is not a righteous people now, they will be. God says He will forgive their iniquity and remember their sin no more, and this will come to pass when the Abrahamic covenant comes into full fruition. At that time the Messiah will finally be their King, they will enjoy the whole Middle East as their homeland, and there will not be an unbelieving Jew anywhere in that kingdom; they will all be believers. It will be the glorious kingdom all the Old Testament looked forward to. Les also notes that Israel was an earthly people with earthly promises, while the church, the body of Christ, is a heavenly people with heavenly promises.