For the lurkers.
There are eight verse that speak of a "new covenant." The first is in Jeremiah 31. Another occurs on the occasion of the Lord's final meal when he celebrated the Passover. Four of the eight occur in the letter to the Hebrews. It's the Hebrews author who states, "When He said, "A new covenant," He has made the first obsolete. But whatever is becoming obsolete and growing old is ready to disappear." As I've already shown, there are only two examples in the Bible when the word "covenant" is spoken of in a plural form. Of the eight mentions of a new covenant and the two about plural covenants, these all occur in the repeated context of God speaking about His covenant in singular form. The very last mention of "covenant" in the Bible is found in Revelation 11.
Revelation 11:19
And the temple of God which is in heaven was opened; and the ark of His covenant appeared in His temple, and there were flashes of lightning and sounds and peals of thunder and an earthquake and a great hailstorm.
And that is a direct and explicit reference back to the Old Testament (and its Law, the manna, and the priesthood). Those are just a few of the relevant, unvarnished facts of scripture. These are a few simple observations anyone can verify objectively for themselves. Not a word of doctrinal interpretation has been added.
However, the fact is, this op is not about the covenants. This op is about whether or not faith is a work. Covenants were brought into the conversation as justification for the unsubstantiated premise there must two (or more different kinds of faith - one Old/old, and the other New/new. The problem with that view is the gospel was preached in the Old Testament!
Galatians 3:1-9 ESV
O foolish Galatians! Who has bewitched you? It was before your eyes that Jesus Christ was publicly portrayed as crucified. Let me ask you only this: Did you receive the Spirit by works of the law or by hearing with faith? Are you so foolish? Having begun by the Spirit, are you now being perfected by the flesh? Did you suffer so many things in vain—if indeed it was in vain? Does he who supplies the Spirit to you and works miracles among you do so by works of the law, or by hearing with faith— just as Abraham “believed God, and it was counted to him as righteousness”? Know then that it is those of faith who are the sons of Abraham. And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel beforehand to Abraham, saying, “In you shall all the nations be blessed.” So then, those who are of faith are blessed along with Abraham, the man of faith.
The gospel was preached to Abraham. I think I already covered this so I'll just summarize it here and if I'm thinking of another thread I'll gladly provide the relevant scriptures. Abraham heard the gospel. Abraham knew he had to leave home to reach the promised land and he knew the city of peace was ruled by a kingly priest (or priestly king). He also knew God had pledge fealty to Himself, pledging His own life if He failed (the suzerain covenant in Abe's vision). Abe knew a son would be sacrificed, God would provide the sacrifice, and if the son died God would raise him from the grave. Abraham knew his singular seed would bring about the covenant promises, and he knew he'd be the father of many nations. Abraham believed all of that! For that faith he was justified and Paul makes it very clear ALL of God's people are justified by faith (whether faith alone or not is irrelevant). The righteous shall live by faith. Furthermore, all the OT people of faith listed in Hebrews 11 are said to be made complete in "us" those who believe in Christ.
Again, I point out these are the facts of scripture. I have not laid a single word of sectarian or doctrinal "interpretation" atop these facts. Anyone can objectively verify each of these statements. They are not up for debate.
While this next point is not said about Abraham (it's written about David) we can reasonably infer Abraham understood it because Abe knew about the God raising the son from the dead.
Acts 2:29-32 ESV
Brothers, I may say to you with confidence about the patriarch David that he both died and was buried, and his tomb is with us to this day. Being therefore a prophet, and knowing that God had sworn with an oath to him that he would set one of his descendants on his throne, he foresaw and spoke about the resurrection of the Christ, that he was not abandoned to Hades, nor did his flesh see corruption. This Jesus God raised up, and of that we all are witnesses.
This is an alarming statement to some. Peter, as reported by Luke, is claiming David was writing about the resurrection and the Son not rotting in the grave! When God swore and oath to David He spoke about the resurrection!
So.....
If the gospel was preached in the OT and that gospel was overtly about Jesus's resurrection in which we find salvation from sin, death, and wrath, what basis then is there for the claim there are two kinds of faith, one old and the other new, one an old covenant faith and the other a new covenant faith?
None