'Slaves' in the Bible

We know that our old natures were crucified with him so that our sin-laden bodies might be rendered powerless and we might no longer be slaves to sin.

Don't you know that when you offer yourselves to someone as obedient slaves, you are slaves of the one you obey either of sin, which leads to death, or of obedience, which leads to righteousness?

But thank God that, though you were once slaves of sin, you became obedient from your hearts to that form of teaching with which you were entrusted!

And since you have been freed from sin, you have become slaves of righteousness.

I am speaking in simple terms because of the frailty of your human nature. Just as you once offered the parts of your body as slaves to impurity and to greater and greater disobedience, so now, in the same way, you must offer the parts of your body as slaves to righteousness that leads to sanctification.

For when you were slaves of sin, you were "free" as far as righteousness was concerned.

But now that you have been freed from sin and have become God's slaves, the benefit you reap is sanctification, and the result is eternal life.