But for salvation as you asked we can see the things taught in scripture able to be traced back throughout examples, metaphors, and so on,
Take the gift of apostles to guide the church.
We can see that throughout the Torah. We see Prophets empowered repeatedly to teach the words of God to his people.
We see these prophets , and apostles, preaching the good news to their people. Those that hear it have a choice. They can accept it or they can reject it. They can choose righteousness or unrighteousness. So they have to choose to believe and repent.
Then there are other things that are tied in. Like circumcision. In order to be added to the Jewish community the males had to be circumcised. Likewise Christianity speaks of a spiritual circumcision and it’s baptism.
Colossians 2:11-12 New American Standard Bible (NASB)
11 and in Him you were also circumcised with a circumcision made without hands, in the removal of the body of the flesh by the circumcision of Christ;12 having been buried with Him in baptism, in which you were also raised up with Him through faith in the working of God, who raised Him from the dead.
We also see the need for those who accept the truth and accept righteousness and purse them that it must be ongoing. Many times the Jewish nation turned their back on god and was taken captive by others. We also see this in the gospels.
New American Standard Bible
15 “If you love Me, you will keep My commandments.
We also see language like those who finish the good race and so on.
Scripture repeatedly lines out how one is saved.