Hebrews 10:28-30

10:28 Someone who rejected the law of Moses was put to death without mercy on the testimony of two or three witnesses. 10:29 How much greater punishment do you think that person deserves who has contempt for the Son of God, and profanes the blood of the covenant that made him holy, and insults the Spirit of grace? 10:30 For we know the one who said, “Vengeance is mine, I will repay,” and again, “The Lord will judge his people.”

Hebrews 10:39

10:39 But we are not among those who shrink back and thus perish, but are among those who have faith and preserve their souls.