1 Corinthians 9:20 (NLT)
When I was with the Jews, I lived like a Jew to bring the Jews to Christ. When I was with those who follow the Jewish law, I too lived under that law. Even though I am not subject to the law, I did this so I could bring to Christ those who are under the law.

1 Corinthians 9:21 (NLT)
When I am with the Gentiles who do not follow the Jewish law, I too live apart from that law so I can bring them to Christ. But I do not ignore the law of God; I obey the law of Christ.

- Whether Paul was "keeping Kosher" with Jews or living as a Gentile amongst non-Jews, he was always obedient to what he calls "the law of Christ." This he refers to elsewhere as "the law of love," for love fulfills the intention of the law.