Romans 6:16-17

Do you not know that when you continually offer yourselves to someone to do his will, you are the slaves of the one whom you obey, either [slaves] of sin, which leads to death, or of obedience, which leads to righteousness (right standing with God)? But thank God that though you were slaves of sin, you became obedient with all your heart to the standard of teaching in which you were instructed and to which you were committed.