Romans 6:16
Do you not know that when you submit to being someone's slaves, and obeying him, you are the slaves of the one whom you obey, whether your slavery is to sin, and leads to death, or is to obedience, and leads to uprightness?
John 8:34
Jesus answered, "I tell you, everyone who commits sin is a slave to sin.
2 Peter 2:19
promising them freedom when they are themselves slaves of destruction; for a man is the slave of whatever overcomes him.
Matthew 6:24
No slave can belong to two masters, for he will either hate one and love the other, or stand by one and make light of the other. You cannot serve God and money.
Romans 6:12-13
So sin must not reign over your mortal bodies, and make you obey their cravings,
Romans 6:17
But, thank God! though you were once slaves of sin, you have become obedient from your hearts to the standard of teaching that you received,
Romans 6:19-23
I use these familiar human terms because of the limitations of your nature. For just as you before gave up the parts of your bodies in slavery to vice and greater and greater license, you must now give them up in slavery to uprightness, which leads to consecration.