John 8:34

34 Jesus answered them, “Truly, truly, I say to you, ^aeveryone who commits sin is the slave of sin.

Romans 6:16-20

16 Do you not ^aknow that when you go on presenting yourselves to someone as ^bslaves for obedience, you are slaves of the one whom you obey, either of ^csin ¹leading to death, or of obedience ²leading to righteousness? 17 But ^athanks be to God that though you were slaves of sin, you obeyed from the heart that ^bpattern of teaching to which you were ^cgiven over, 18 and having been ^afreed from sin, you became slaves of righteousness. 19 ^aI am speaking in human terms because of the weakness of your flesh. For just ^bas you presented your members as slaves to impurity and to lawlessness, ¹leading to further lawlessness, so now present your members as slaves to righteousness, ²leading to sanctification.
20 For ^awhen you were slaves of sin, you were free in regard to righteousness.

2 Peter 2:19

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19 promising them freedom while they themselves are slaves of corruption; for ^aby what a man is overcome, by this he is enslaved.