Hebrews 6:4

4For it is impossible to keep on restoring to repentance time and again people who have once been enlightened, who have tasted the heavenly gift, who have become sharers of the Holy Spirit,Matt 12:31-32; John 4:10; 6:32; Gal 3:2, 5; Eph 2:8; Heb 2:4; 2Pet 2:20-21; 1John 5:16

Hebrews 10:26

26For if we choose to go on sinning after we have received the full knowledge of the truth, there no longer remains a sacrifice for sins,Num 15:30; Heb 6:4; 2Pet 2:20-21

2 Peter 2:20-22

20For if, after escaping the world's corruptions through a full knowledge of our Lord and Savior Jesus Christ, they are again entangled and conquered by them, then their last condition is worse than their former one.Matt 12:45; Luke 11:26; Heb 6:4; 10:26-27; 2Pet 1:2, 4, 18 21It would have been better for them not to have known the way of righteousness than to know it and turn their backs on the holy commandment that was committed to them.Luke 12:47-48; John 9:41; 15:22 22The proverb is true that describes what has happened to them: “A dog returns to its vomit,”
Prov 26:11
and “A pig that is washed goes back to wallow in the mud.”
The source of this quotation appears to be the Syrian Story of Ahikar.
Prov 26:11

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