Christ death results in the salvation of those He died for, so much so, He is called the Captain of their Salvation Heb 2:10

10 For it became him, for whom are all things, and by whom are all things, in bringing many sons unto glory, to make the captain of their salvation perfect through sufferings.

Mine you, this is in the context of having tasted death for every man in Vs 9. Through and by His death, or His suffering unto death, He became the Captain of their Salvation, through tasting[experiencing] death. Now the word captain is the greek word archēgos and means:

the author, that by which anything begins to be, the origin, the active cause

So by His sufferings, tasting death, He became the originator, the active cause, Captain of their Salvation. It was by this means the Father ordained many sons to Glory.

BTW the word captain is the same word author in Heb 12:2

Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God.

Christ is the author/source of our Faith. This would include the OT Saints that went before in Heb 11 as well. Christ their Mediator was the source of their faith.