2 Peter 2:21-22 It would have been better for them never to have known the way of righteousness than, having known it, to turn back and abandon the holy commandment that was handed on to them. What happened to them manifests the truth of the proverbs: “The dog returns to its own vomit,” and “The washed sow returns to wallowing in the mud.”
Hebrews 10:26
Apostasy Remains Unforgiven. If we deliberately persist in sin after having received the knowledge of the truth, then there no longer remains any sacrifice for sins.