John 8:34

8:34 Jesus answered them, “I tell you the solemn truth, everyone who practices sin is a slave of sin.

Romans 6:12-14

6:12 Therefore do not let sin reign in your mortal body so that you obey its desires, 6:13 and do not present your members to sin as instruments to be used for unrighteousness, but present yourselves to God as those who are alive from the dead and your members to God as instruments to be used for righteousness. 6:14 For sin will have no mastery over you, because you are not under law but under grace.

Romans 6:16-22

6:16 Do you not know that if you present yourselves as obedient slaves, you are slaves of the one you obey, either of sin resulting in death, or obedience resulting in righteousness? 6:17 But thanks be to God that though you were slaves to sin, you obeyed from the heart that pattern of teaching you were entrusted to, 6:18 and having been freed from sin, you became enslaved to righteousness. 6:19 (I am speaking in human terms because of the weakness of your flesh.) For just as you once presented your members as slaves to impurity and lawlessness leading to more lawlessness, so now present your members as slaves to righteousness leading to sanctification. 6:20 For when you were slaves of sin, you were free with regard to righteousness.

6:21 So what benefit did you then reap from those things that you are now ashamed of? For the end of those things is death. 6:22 But now, freed from sin and enslaved to God, you have your benefit leading to sanctification, and the end is eternal life.

Titus 3:3

3:3 For we too were once foolish, disobedient, misled, enslaved to various passions and desires, spending our lives in evil and envy, hateful and hating one another.