1 Corinthians 9:20-22

20And 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:

21to those without law, as without law, (not as without law to 1God, but as legitimately subject to Christ,) in order that I might gain [those] without law.

22I became to the weak, [as] weak, in order that I might gain the weak. To all I have become all things, in order that at all events I might save some.