1 Corinthians 9:19-21

Now, even though I am free from obligations to others, I joyfully make myself a servant to all in order to win as many converts as possible. I became Jewish to the Jewish people in order to win them to the Messiah. I became like one under the law to gain the people who were stuck under the law, even though I myself am not under the law. And to those who are without the Jewish laws, I became like them, as one without the Jewish laws, in order to win them, although I’m not outside the law of God but under the law of Christ.