2 Peter 2:19-22 NIV

19 They promise them freedom, while they themselves are slaves of depravity--for a man is a slave to whatever has mastered him.1

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20 If they have escaped the corruption of the world by knowing2 our Lord and Savior Jesus Christ3 and are again entangled in it and overcome, they are worse off at the end than they were at the beginning.4

References for 2 Peter 2:20

21 It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them.5

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22 Of them the proverbs are true: "A dog returns to its vomit,"a6 and, "A sow that is washed goes back to her wallowing in the mud."

References for 2 Peter 2:22