Romans 6:20
For when you were slaves of sin, you were free so far as doing right was concerned.
Romans 6:16-17
Do you not know that when you habitually offer yourselves to anyone for obedience to him, you are slaves to that one whom you are in the habit of obeying, whether it is the slavery to sin whose end is death or to obedience whose end is right-doing?
John 8:34
Jesus answered them, "I most solemnly say to you, everyone who lives in sin is a slave of sin.
Treasury of Scripture Knowledge
Summary
For when ye were the servants of sin, ye were free from righteousness.
The servants
General references
Bible References
The servants
Romans 6:16
Do you not know that when you habitually offer yourselves to anyone for obedience to him, you are slaves to that one whom you are in the habit of obeying, whether it is the slavery to sin whose end is death or to obedience whose end is right-doing?
John 8:34
Jesus answered them, "I most solemnly say to you, everyone who lives in sin is a slave of sin.
General references
Colossians 3:7
You too used to practice these sins, when you used to live that sort of life.