1 Corinthians 9

19 Though I am free of obligation to anyone, I make myself a slave to everyone, to win as many as possible. 20 To the Jews I became like a Jew, to win the Jews. To those under the law I became like one under the law (though I myself am not under the law), to win those under the law. 21 To those without the law I became like one without the law (though I am not outside the law of God but am under the law of Christ), to win those without the law.