The Substance of Justifying Faith is "the righteousness of God" in Christ

Rom. 3:21 But now the righteousness of God without the law is manifested, being witnessed by the law and the prophets;
22 Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:

Abraham is the pattern set forth in God's word "for all who are of faith" with regard to the Biblical doctrine of justification.

The justifying faith of Abraham was not generic faith in any generic promise of God. That is pure false doctrine. The righteousness of God provided in Christ as promised in the gospel to Adam (Gen. 3:15) and to Abraham (Gal. 3:6-8) and to David (1 Sam. 23:5) to you and me is the one and only true "substance" of justifying faith. Any faith void of this substance is not justifying faith and offers no hope at all.

The "righteousness which is by faith" means it is communicated from God to the believer through faith, as faith embraces the provision in Christ as promised in the gospel, thus God imputes it to the believer. It is this righteousness and this righteousness ALONE that justifies the believer before God.

This is how Abraham was justified before God and this is how every child of God is justified before God, regardless when they lived from Genesis to Revelation. Those who deny this are denying the very heart of the gospel of Jesus Christ.