However, it did still stand as a witness against the nations. As an example of what will happen when the nations refuse the commands of God given through the Spirit under the new covenant. The law that applied to Israel was to cause they who it applied to, and the nations it did not, to realize the universal need for Jesus.
Romans 11
28 As far as the gospel is concerned, they are enemies for your sake; but as far as election is concerned, they are loved on account of the patriarchs,
29 for God’s gifts and his call are irrevocable.
30 Just as you who were at one time disobedient to God have now received mercy as a result of their disobedience,
31 so they too have now become disobedient in order that they too may now receive mercy as a result of God’s mercy to you.
32 For God has bound everyone over to disobedience so that he may have mercy on them all.
When the nations see Israel bound up and offered as a sacrifice for her disobedience they should be thinking about the mercy God had on them when they were in the same condition of disobedience. Even though never given the law it witnesses against all who are disobedient to God. God humbled Israel with a law he did not give the nations. So the nations would see the ramifications of disobedience. Then, when the law of the Spirit is applied to all the nations of the world (including Israel) as it is through Jesus today, you will have the example of what NOT to do, and what happens when you disobey. Jesus is Israel's example, and the worlds. And so Jesus redeems us both. He represented Israel being bound and sacrificed, and redeemed. If you are a child of Abraham you understand these things. Because the Spirit has taught and reminded you of them.