'Bond servants' in the Bible

and even upon My bondservants, both men and women, at that time, I will pour out My Spirit, and they shall prophesy.

And now, Lord, take note of their threats, and grant that Your bond-servants may speak Your word with all confidence,

Following after Paul and us, she kept crying out, saying, “These men are bond-servants of the Most High God, who are proclaiming to you the way of salvation.”