NET
20 To the Jews I became like a Jew to gain the Jews. To those under the law I became like one under the law (though I myself am not under the law) to gain those under the law.
Darby
20 And I became to the Jews as a Jew, in order that I might gain the Jews: to those under law, as under law, not being myself under law, in order that I might gain those under law:
KJV
20 And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;