Modern evangelicals often dismiss the Old Testament law as something no longer necessary. Since the death and resurrection of Christ, we are now under grace and not the law, so they set aside the law in favor of grace. But that doesn’t square with what Jesus taught. He said He did not come to abolish the law but to fulfill it (Matthew 5:17).
Jesus was the first and last man to keep God’s laws perfectly. Thus, He fulfilled the law. The problem is, neither you, me, nor anyone else can keep the law. We need the blood, mercy, and grace of Jesus to save us from our sins against the holy God. And what is sin but a breaking of the laws of God?