Romans 6:16
Don't you know that to whom you present yourselves as servants to obedience, his servants you are whom you obey; whether of sin to death, or of obedience to righteousness?
John 8:34
Jesus answered them, "Most certainly I tell you, everyone who commits sin is the bondservant of sin.
2 Peter 2:19
promising them liberty, while they themselves are bondservants of corruption; for a man is brought into bondage by whoever overcomes 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 be devoted to one and despise the other. You can't serve both God and Mammon.
Joshua 24:15
If it seems evil to you to serve Yahweh, choose this day whom you will serve; whether the gods which your fathers served that were beyond the River, or the gods of the Amorites, in whose land you dwell: but as for me and my house, we will serve Yahweh."
Romans 6:12-13
Therefore don't let sin reign in your mortal body, that you should obey it in its lusts.
Romans 6:17
But thanks be to God, that, whereas you were bondservants of sin, you became obedient from the heart to that form of teaching whereunto you were delivered.
Romans 6:19-23
I speak in human terms because of the weakness of your flesh, for as you presented your members as servants to uncleanness and to wickedness upon wickedness, even so now present your members as servants to righteousness for sanctification.