I Corinthians 9:20

I became as a Jew--in things not defined by the law, but by Jewish usage. Not Judaizing in essentials, but in matters where there was no compromise of principle (compare Act 16:3; Act 21:20-26); an undesigned coincidence between the history and the Epistle, and so a sure proof of genuineness. to them that are under the law, as under the law--in things defined by the law; such as ceremonies not then repugnant to Christianity. Perhaps the reason for distinguishing this class from the former is that Paul himself belonged nationally to "the Jews," but did not in creed belong to the class of "them that are under the law." This view is confirmed by the reading inserted here by the oldest manuscripts, versions, and Fathers, "not being (that is, parenthetically, 'not that I am') myself under the law."

In this chapter the apostle seems to answer some cavils against himself. I. He asserts his apostolical mission and authority, and gives in his success among them as a testimony to it (Co1 9:1, Co1 9:2). II. He claims a right to subsist by his ministry, and defends it by several arguments from natural reason and the Mosaical law, and asserts it also to be a constitution of Christ (Co1 9:3-14). III. He shows that he had willingly waived this privilege and power for their benefit (Co1 9:15-18). IV. He specifies several other things, in which he had denied himself for the sake of other men's spiritual interest and salvation (Co1 9:19-23). And, V. Concludes his argument by showing what animated him to this course, even the prospect of an incorruptible crown (Co1 9:24 to the end.)