Romans 6:20

New King James Version

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

Cross References

John 8:34

Jesus answered them, “Most assuredly, I say to you, whoever commits sin is a slave of sin.

Matthew 6:24

“No one can serve two masters; for either he will hate the one and love the other, or else he will be loyal to the one and despise the other. You cannot serve God and mammon.