'Slave' in the Bible

just as you learned [it] from Epaphras, our dear fellow slave who is a faithful minister of Christ [on] our behalf,

where there is neither Greek nor Jew, circumcision nor uncircumcision, barbarian, Scythian, slave, [or] free, but Christ [is] all, and in all.

Tychicus, my dear brother and faithful servant and fellow slave in the Lord, will make known to you all {my circumstances},

Epaphras, who is [one] of you, greets you, a slave of Christ always struggling on behalf of you in his prayers, that you may stand mature and fully assured in all the will of God.