Romans 6:17-20

Thank God! Once you were slaves of sin, but now you wholeheartedly obey this teaching we have given you. Now you are free from your slavery to sin, and you have become slaves to righteous living. Because of the weakness of your human nature, I am using the illustration of slavery to help you understand all this. Previously, you let yourselves be slaves to impurity and lawlessness, which led ever deeper into sin. Now you must give yourselves to be slaves to righteous living so that you will become holy. When you were slaves to sin, you were free from the obligation to do right.