1 Corinthians (1 Co) 9:20

That is, with Jews, what I did was put myself in the position of a Jew, in order to win Jews. With people in subjection to a legalistic perversion of the Torah, I put myself in the position of someone under such legalism, in order to win those under this legalism, even though I myself am not in subjection to a legalistic perversion of the Torah.