'Slave' in the Bible

Everything is allowable to me, but not everything is profitable. Everything is allowable to me, but to nothing will I become a slave.

If, however, the unbeliever is determined to leave, let him or her do so. Under such circumstances the Christian man or woman is no slave; God has called us to live lives of peace.

Were you a slave when God called you? Let not that weigh on your mind. And yet if you can get your freedom, take advantage of the opportunity.

For a Christian, if he was a slave when called, is the Lord's freed man, and in the same way a free man, if called, becomes the slave of Christ.

Though free from all human control, I have made myself the slave of all in the hope of winning as many converts as possible.