'Free' in the Bible

Were you called while a slave? Do not worry about it; but if you are able also to become free, rather do that.

For he who was called in the Lord while a slave, is the Lord’s freedman; likewise he who was called while free, is Christ’s slave.

But I want you to be free from concern. One who is unmarried is concerned about the things of the Lord, how he may please the Lord;

A wife is bound as long as her husband lives; but if her husband is dead, she is free to be married to whom she wishes, only in the Lord.

Am I not free? Am I not an apostle? Have I not seen Jesus our Lord? Are you not my work in the Lord?

For though I am free from all men, I have made myself a slave to all, so that I may win more.

For by one Spirit we were all baptized into one body, whether Jews or Greeks, whether slaves or free, and we were all made to drink of one Spirit.