Romans 6:16
Do you not know that to whomever you present yourselves [as] slaves for obedience, you are slaves to whomever you obey, whether sin, [leading] to death, or obedience, [leading] to righteousness?
John 8:34
Jesus replied to them, "Truly, truly I say to you, that everyone who commits sin is a slave of sin.
2 Peter 2:19
promising them freedom [although they] themselves are slaves of depravity. For to whatever someone succumbs, by this he is also enslaved.
Matthew 6:24
"No one is able to serve two masters. For either he will hate the one and love the other, or he will be devoted to one and despise the other. You are not able to serve God and money.
Joshua 24:15
But if it is bad in your eyes to serve Yahweh, choose for yourselves today whom you want to serve, whether it is the gods that your ancestors served beyond the river, or the gods of the Amorites in whose land you [are] living; but as for me and my household, we will serve Yahweh."
Romans 6:12-13
Therefore do not let sin reign in your mortal body, so that [you] obey its desires,
Romans 6:17
But thanks [be] to God that you were slaves of sin, but you have obeyed from the heart the pattern of teaching to which you were entrusted,
Romans 6:19-23
(I am speaking in human terms because of the weakness of your flesh.) For just as you presented your members [as] slaves to immorality and lawlessness, [leading] to lawlessness, so now present your members [as] slaves to righteousness, [leading] to sanctification.