The Promise that the Just shall live by Faith is a Promise that everyone Christ died for shall live by Faith. Let me explain why ! Scripture says in Rom 5:19 19For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made righteous. This obedience of one, I understand it, is Christ's Obedience unto Death, even the Death of the Cross ! Phil 2:8 8And being found in fashion as a man, he humbled himself, and became obedient unto death, even the death of the cross. Now, by this, Christ's obedience unto Death, many shall be made Righteous ! Folks when scripture says something shall be done, it is a Divine Promise of God, so, we can count on it that all whom Christ represented when He died shall be made Righteous. Now, the word Righteous here is the greek word dikaios and is translated in the NT as the word Just no less than 33 times. So, Rom 5:19 can also read without violating grammar like this Rom 5:19 19For as by one man's disobedience many were made sinners, so by the obedience of one shall many be made Just. And so the Promise reads as thus: Hab 2:4 Behold, his soul which is lifted up is not upright in him: but the just shall live by his faith. Gal 3:11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. Again, the word shall is used to denote a Promise of God ! So, all those Christ died for, and by His Death of obedience made Just, all such made, shall live by Faith ! Simply said, Christ's Obedient Death is the cause of one living by Faith ! So now we should better understand what the writer of Hebrews wrote here Heb 12:2 2Looking 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. I challenge anyone to prove this conclusion unscriptural and not true by scripture !