Hebrews 9:12-14, 16, 26

With his own blood—not the blood of goats and calves—he entered the Most Holy Place once for all time and secured our redemption forever. Under the old system, the blood of goats and bulls and the ashes of a heifer could cleanse people’s bodies from ceremonial impurity. Just think how much more the blood of Christ will purify our consciences from sinful deeds so that we can worship the living God. For by the power of the eternal Spirit, Christ offered himself to God as a perfect sacrifice for our sins.

Now when someone leaves a will, it is necessary to prove that the person who made it is dead.

If that had been necessary, Christ would have had to die again and again, ever since the world began. But now, once for all time, he has appeared at the end of the age to remove sin by his own death as a sacrifice.