Hebrews 10:29-30

29How 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? 30For we know him who said, “It is mine to avenge; I will repay,” Deut. 32:35 and again, “The Lord will judge his people.” Deut. 32:36; Psalm 135:14