Romans 6:16
Do you not know that if you surrender yourselves as bondservants to obey any one, you become the bondservants of him whom you obey, whether the bondservants of Sin (with death as the result)
John 8:34
"In most solemn truth I tell you," replied Jesus, "that every one who commits sin is the slave of sin.
2 Peter 2:19
And they promise them freedom, although they are themselves the slaves of what is corrupt. For a man is the slave of any one by whom he has been worsted in fight.
Matthew 6:24
"No man can be the bondservant of two masters; for either he will dislike one and like the other, or he will attach himself to one and think slightingly of the other. You cannot be the bondservants both of God and of gold.
Romans 6:12-13
Let not Sin therefore reign as king in your mortal bodies, causing you to be in subjection to their cravings;
Romans 6:17
But thanks be to God that though you were once in thraldom to Sin, you have now yielded a hearty obedience to that system of truth in which you have been instructed.
Romans 6:19-23
your human infirmity leads me to employ these familiar figures--and just as you once surrendered your faculties into bondage to Impurity and ever-increasing disregard of Law, so you must now surrender them into bondage to Righteousness ever advancing towards perfect holiness.