What does sanctified mean in Hebrews 10:29?

The word sanctified means “set apart,” with the idea of being reserved for a special use. The Greek word (hagiazō), translated as “sanctified” in Hebrews 10:29, means “to be set apart or become dedicated to God; made holy; consecrated.” The term describes the divine act of setting something or someone aside as sacred. Synonyms for sanctified can be holy, consecrated, and hallowed.

The book of Hebrews details the superiority of the New Covenant over the Old. Hebrews 10:28–29 emphasizes the consequence of disregarding God’s covenant: “Anyone who rejected the law of Moses died without mercy. . . . 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?” The “blood of the covenant” here refers to the blood Jesus shed on the cross. Rejecting that sacrifice or treating it as common is akin to insulting the Holy Spirit and trampling the Son of God underfoot.

Hebrews 10:29 is part of a “warning passage” found in the book of Hebrews. It is one of five such passages in the book (Hebrews 2:1–4; 4:12–13; 6:4–8; 10:26–31; 12:25–29). Each of these passages warns of severe consequences for sinfully turning away from the gospel: “For we know him who said, . . . ‘The Lord will judge his people.’ It is a dreadful thing to fall into the hands of the living God” (Hebrews 10:30–31). Who exactly is being warned? There are three schools of thought:

Interpretation 1: The warning is directed at believers who lose their salvation

Some argue that Hebrews 10:26–31 refers to a loss of salvation. But this cannot be the proper interpretation, because other passages in the Bible plainly teach the believer’s security in Christ (e.g., Romans 8:31–39; 1 Peter 1:3–5; John 6:47; 10:27–30).

Interpretation 2: The warning is directed at believers who keep their salvation but face God’s discipline

Hebrews 10:29 specifically refers to one who “was sanctified” by the blood of the New Covenant and therefore seems to be speaking of believers. The context of the New Testament and the book of Hebrews indicates that salvation cannot be lost, so this is not a Christian falling from grace into damnation; rather, this is a believer failing to obey the Lord and suffering the consequences. The discipline of a believer will be severe since believers, of all people, know better than to disobey the Lord.

Interpretation 3: The warning is directed at unbelievers on the verge of rejecting Christ

Another viable interpretation is that this passage is meant to warn false converts. The warning of Hebrews 10:29 is directed at Jewish individuals who heard and understood the gospel and may even have made a profession of faith; nevertheless, they were on the brink of turning away from Christ. They were tempted to return to the Old Covenant. To do so after they had “received the knowledge of the truth” (Hebrews 10:26) would be to insult the Spirit of grace and profane the blood of the New Covenant (verse 29). Such would-be apostates are warned that, if they reject Christ’s sacrifice, “no sacrifice for sins is left” (Hebrews 10:26).

In this view, what does the word sanctified mean? It still means “set apart,” but it does not refer to the unbelievers. More literal translations offer a clue as to exactly who was sanctified:

The verse mentions two people: the one who deserves punishment (the apostate) and the Son of God. The question is, who was “sanctified”? In this third interpretation, it is the Son who was sanctified, not the apostate. The shedding of His blood set Christ apart from all other men (see John 17:19).

In any of the above interpretations, sin is a serious offense against God, deserving of severe punishment. To disregard the value of Christ’s sacrifice is to insult the Spirit. When we truly grasp all that God has done for us, we ought never have a casual attitude toward sin.