Do Gentiles have any part in the service and ritual practice connected with the Law?
No, Gentiles have no part in the service connected with the Law or the practice of the ritual. That service and ritual practice was strictly for the nation of Israel, as a total part of the giving of the Law. It was not given to Gentiles.
Les explains that the next part of that verse deals with the service connected with the Law and the practice of the Ritual. He states plainly that Gentiles have no part in these things. That service and ritual practice was strictly for the nation of Israel and was a total part of the giving of the Law.