Hmm, Jerry when you mean Salvation, are we also talking about Jews going into Abraham’s bosom? Cause going into there I would disagree… But being freed from there, into Heaven, I would agree is Jesus Christ giving them salvation.
Only reason I say this - Jews had no way of Knowing who/why they would be free other than knowing that their Lord their God is a loving God that wants to be with them. But the actual work of being liberated from this place of death would of had to of been by Christ.
Psalm 18 for reference.