Hebrews 9:16 introduces the legal principle that a covenant requires death — the context that explains why blood is needed here.

Hebrews 9:17 continues: a will only takes effect when the testator dies — the death behind the blood of vs.20.

In Hebrews 13:20, the same 'blood of the eternal covenant' phrase reappears, tying the book's conclusion back to this foundational quote.

In Matthew 26:28, Jesus speaks the same words at the Last Supper, directly applying the covenant blood to his own sacrifice.

Exodus 24:8 is the source: Moses sprinkles the blood and declares 'This is the blood of the covenant'.

Zechariah 9:11 uses 'blood of your covenant' as a basis for deliverance, prefiguring the new covenant blood here.