ἐφάπαξ

After that, He appeared to more than five hundred brothers at once, most of whom are still living, though some have fallen asleep.

And by that will, we have been sanctified through the sacrifice of the body of Jesus Christ once for all.

Unlike the other high priests, He does not need to offer daily sacrifices, first for His own sins and then for the sins of the people; He sacrificed for sin once for all when He offered up Himself.

He did not enter by the blood of goats and calves, but He entered the Most Holy Place once for all by His own blood, thus securing eternal redemption.

The death He died, He died to sin once for all; but the life He lives, He lives to God.