Are believers under the Law of the oldness of the letter?
No, believers are not under that Law of the oldness of the letter. They are delivered from the Law, which was an administration of death, and now serve in newness of spirit, not in the oldness of the letter, having been transformed by believing the Gospel.
Les explains that the Law was an administration of death, and believers are delivered from it so they should serve in newness of spirit, not in the oldness of the letter. He clarifies that the Law is what Paul is talking about, and believers are not under that Law of the oldness of the letter but are in a whole new frame of thinking—the spiritual realm. Les says this transformation comes by believing the Gospel. He connects this to Galatians 3:3, where Paul asks if having begun in the Spirit, they are now made perfect by the flesh, and notes the flesh wants legalism and Law, part of the old Adamic nature. He also references Galatians 3:4-5 about suffering in vain.