Romans 6:20

King James 3 - The Literal Traslation

For when you were slaves of sin, you were free to righteousness.

Cross References

Matthew 6:24

No one is able to serve two lords; for either he will hate the one, and he will love the other; or he will cleave to the one, and he will despise the other. You are not able to serve God and wealth.

John 8:34

Jesus answered them, Truly, truly, I say to you, Everyone practicing sin is a slave of sin.