Romans 6:22

22But now that you ahave been set free from sin and bhave become slaves of God, cthe fruit you get leads to sanctification and dits end, eternal life.

1 Corinthians 7:22-23

22For he who was called in the Lord as a bondservant is ea freedman of the Lord. Likewise he who was free when called is fa bondservant of Christ. 23 gYou were bought with a price; hdo not become bondservants
Or slaves (for the contextual rendering of the Greek word doulos, see Preface)
of men.

1 Corinthians 9:19

19For jthough I am free from all, kI have made myself a servant to all, that I might lwin more of them.

1 Corinthians 9:21

21To mthose outside the law I became nas one outside the law (not being outside the law of God but ounder the law of Christ) that I might win those outside the law.

Galatians 5:13

13For you were called to freedom, brothers. pOnly do not use your freedom as an opportunity for the flesh, but through love qserve one another.
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