11 After this ordeal, he will see satisfaction. “By his knowing [pain and sacrifice], my righteous servant makes many righteous; it is for their sins that he suffers.
12 Therefore I will assign him a share with the great, he will divide the spoil with the mighty, for having exposed himself to death and being counted among the sinners, while actually bearing the sin of many and interceding for the offenders.” source
After this ordeal, He will see satisfaction.
Hebrews 12:2 King James Version
For the joy that was set before Him —
It was foretold in Isaiah and confirmed again and again; like here in Hebrews.
That joy, that satisfaction was procuring our salvation.