Hebrews 6:18, Hebrews 6:4 Web

1 Samuel 15:29 NIV
He who is the Glory of Israel does not lie or change his mind; for he is not a human being, that he should change his mind.”

2 Peter 2:20-22 NIV
If they have escaped the corruption of the world by knowing our Lord and Savior Jesus Christ and are again entangled in it and are overcome, they are worse off at the end than they were at the beginning. 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. Of them the proverbs are true: “A dog returns to its vomit,” and, “A sow that is washed returns to her wallowing in the mud.”

2 Timothy 2:13 NIV
if we are faithless, he remains faithful, for he cannot disown himself.

Hebrews 10:26-29 NIV
If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. Anyone who rejected the law of Moses died without mercy on the testimony of two or three witnesses. How much more severely do you think someone deserves to be punished who has trampled the Son of God underfoot, who has treated as an unholy thing the blood of the covenant that sanctified them, and who has insulted the Spirit of grace?

John 15:6 NIV
If you do not remain in me, you are like a branch that is thrown away and withers; such branches are picked up, thrown into the fire and burned.

Matthew 5:13 NIV
“You are the salt of the earth. But if the salt loses its saltiness, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled underfoot.

Numbers 23:19 NIV
God is not human, that he should lie, not a human being, that he should change his mind. Does he speak and then not act? Does he promise and not fulfill?

Titus 1:2 NIV
in the hope of eternal life, which God, who does not lie, promised before the beginning of time,