NET
21 To those free from the law I became like one free from the law (though I am not free from God’s law but under the law of Christ) to gain those free from the law.
Darby
21 to those without law, as without law, (not as without law to God, but as legitimately subject to Christ,) in order that I might gain [those] without law.
KJV
21 To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law.