Romans 6:16
Or know ye not that to whom ye present yourselves slaves to obey, his slaves ye are to whom ye obey, whether of sin unto death or of the obedience unto righteousness?
John 8:34
Jesus answered them, Verily, verily, I say unto you, Whosoever commits sin is the slave of sin.
2 Peter 2:19
promising them liberty, being they themselves the slaves of corruption: for he who is overcome by someone is subject to bondage by the one that overcame him.
Matthew 6:24
No one can serve two masters, for either he will hate the one and love the other or else he will hold to the one and despise the other. Ye cannot serve God and riches.
Joshua 24:15
And if it seems evil unto you to serve the LORD, choose you this day whom ye will serve, whether the gods which your fathers served that were on the other side of the river or the gods of the Amorites, in whose land ye dwell; but as for me and my house, we will serve the LORD.
Romans 6:12-13
Therefore do not let sin reign in your mortal body that ye should obey it in the lusts thereof.
Romans 6:17
Thank God that, although ye were the slaves of sin, ye have obeyed from the heart that form of doctrine unto which ye are delivered;
Romans 6:19-23
I speak a human thing because of the weakness of our flesh: that as ye presented your members to serve uncleanness and iniquity unto iniquity, likewise now present your members to serve righteousness unto holiness.