Shared ground
Hebrews 9:18–22 says the first covenant was put into effect with blood, not without it. The writer points to Moses: he spoke God’s commands to all the people, then performed a blood-sprinkling rite involving animals and other ritual items. In this retelling, blood marks both the covenant’s “official start” and the ongoing setting apart of the worship space and its tools.
The passage also ties blood to “cleansing” under the law and then states a broad rule: without the shedding of blood, there is no “remission” (a kind of release that can include forgiveness).
Where interpretation differs (only where needed)
Some readers take the last line (“without shedding of blood there is no remission”) as a universal statement about how God must always forgive sins in every era and circumstance.
Others read it more narrowly: the author is summarizing how the law’s sacrificial system worked for Israel’s worship and purity categories, not describing every possible way God may grant forgiveness.
Some also differ on what “remission” emphasizes here: mainly forgiveness of sins, or mainly release from ritual uncleanness (or both together).
Why the disagreement exists
The author uses sweeping language (“nearly everything,” “no remission”) while also signaling limits (“nearly”). And Hebrews moves between ritual cleansing language and moral guilt language across the chapter, so interpreters weigh those connections differently.
What this passage clearly contributes
This passage anchors the author’s larger argument (9:15–17) in Israel’s own covenant-start story: covenant relationship and authorized worship were presented as blood-linked. It also provides a principle-like summary of the law’s pattern: blood is central to cleansing, and “shedding” is tied to “remission,” even while the author allows for exceptions by saying “nearly everything.”