King James Version
For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:New International Version
(Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law,Catholic Public Domain Version
For when the Gentiles, who do not have the law, do by nature those things which are of the law, such persons, not having the law, are a law unto themselves