'Bondmen' in the Bible

Know ye not that to whom ye yield yourselves bondmen for obedience, ye are bondmen to him whom ye obey, whether of sin unto death, or of obedience unto righteousness?

But thanks be to God, that ye were bondmen of sin, but have obeyed from the heart the form of teaching into which ye were instructed.

Now, having got your freedom from sin, ye have become bondmen to righteousness.

For when ye were bondmen of sin ye were free from righteousness.

But now, having got your freedom from sin, and having become bondmen to God, ye have your fruit unto holiness, and the end eternal life.