Romans 6:16-18

16Don’t you know that if you offer to be someone’s slave, you must obey that master? Either your master is sin, or your master is obedience. Letting sin be your master leads to death. Letting obedience be your master leads to God’s approval.

17You were slaves to sin. But I thank God that you have become wholeheartedly obedient to the teachings which you were given.

18Freed from sin, you were made slaves who do what God approves of.