A Slave to the Gospel
1 Corinthians 9: 16-23
1Co 9:16 For though I preach the gospel, I have nothing to glory of: for necessity is laid upon me; yea, woe is unto me, if I preach not the gospel!
1Co 9:17 For if I do this thing willingly, I have a reward: but if against my will, a dispensation of the gospel is committed unto me.
1Co 9:18 What is my reward then? Verily that, when I preach the gospel, I may make the gospel of Christ without charge, that I abuse not my power in the gospel.
1Co 9:19 For though I be free from all men, yet have I made myself servant unto all, that I might gain the more.
1Co 9:20 And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;
1Co 9:21 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.
1Co 9:22 To the weak became I as weak, that I might gain the weak: I am made all things to all men, that I might by all means save some.
1Co 9:23 And this I do for the gospel's sake, that I might be partaker thereof with you.

Union Gospel Press
Believers Bible Commentary
esword.com
Matthew Henry Concise Commentary
https://www.biblestudytools.com/commentaries/matthew-henry-complete/
http://www.bible-studys.org/index