Abraham, the father of our Faith!
You can read about Abraham's life in Genesis chapters 11 to 25
Romans 4: 3-25
3 For what does the Scripture say? "And Abraham believed God, and it was counted to him for righteousness."  4 Now to one working, the reward is not counted according to grace, but according to debt. 5 But to the one not working, but believing on Him justifying the ungodly, his faith is counted for righteousness. 6 Even as also David says of the blessedness of the man to whom God counts righteousness apart from works: 7 "Blessed are those whose lawlessnesses are forgiven, and whose sins are covered; 8 blessed the man to whom the Lord will in no way charge sin."  9 Is this blessedness then on the circumcision, or also on the uncircumcision? For we say the faith "was counted to Abraham for righteousness." 10 How then was it counted? Being in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision! 11 And he received a sign of circumcision as a seal of the righteousness of faith while in uncircumcision, for him to be a father of those believing through uncircumcision, for righteousness to be counted to them also, 12 and a father of circumcision to those not of circumcision only, but also to those walking in the steps of the faith of our father Abraham during uncircumcision. 13 For the promise was not through Law to Abraham, or to his seed, for him to be the heir of the world, but through a righteousness of faith. 14 For if those of Law are heirs, faith has been made of no effect, and the promise has been annulled. 15 For the Law works out wrath; for where no law is, neither is transgression. 16 On account of this, it is of faith, that it be according to grace, for the promise to be certain to all the seed, not to that of the Law only, but also to that of the faith of Abraham, who is father of us all,
17 according as it has been written, "I have appointed you a father of many nations;" before God, whom he believed, the One making the dead live, and calling the things that are not as if they were.  18 He against hope believed in hope, for him to become a father of many nations, according to what has been said, "So shall your seed be." 19 And being about a hundred years old, not weakening in faith, he did not consider his body to have died already, nor yet the death of Sarah's womb, 20 and did not stagger by unbelief at the promise of God, but was empowered by faith, giving glory to God, 21 and being fully persuaded that what He has promised, He is also able to do. 22 Because of this, "it was also counted to him for righteousness."  
23 But it was not written for him only, that it was counted to him, 24 but also on account of us, to whom it is about to be counted, to the ones believing on Him who has raised our Lord Jesus from the dead, 25 who was delivered because of our deviations, and was raised because of our justification.

Galatians 3: 5-29 
5 Then He supplying the Spirit to you and working works of power in you, is it by works of Law or by hearing of faith? 6 Even "as Abraham believed God, and it was counted to him for righteousness," 7 know, then, that those of faith, these are sons of Abraham. 8 And the Scripture foreseeing that God would justify the nations by faith, preached the gospel before to Abraham: "All the nations will be blessed" "in you." 
‚Äč9 So that those of faith are blessed with the faithful Abraham. 10 For as many as are out of works of Law, these are under a curse. For it has been written, "Cursed is everyone who does not continue in all the things having been written in the book of the Law, to do them." 11 And that no one is justified by Law before God is clear because, "The just shall live by faith." 12 But the Law is not of faith, but, "The man doing these things shall live in them." 13 Christ redeemed us from the curse of the Law, having become a curse for us; for it has been written, "Cursed is everyone having been hung on a tree;" 14 that the blessing of Abraham might be to the nations in Christ Jesus, that we might receive the promise of the Spirit through faith. 15 Brothers, I speak according to man, a covenant having been ratified, even among mankind, no one sets aside or adds to it. 16 But the promises were spoken to Abraham and to his Seed (it does not say, And to seeds, as of many, but as of one, "And to your Seed," which is Christ). 17 And I say this, A covenant having been ratified before to Christ by God, the Law coming into being four hundred and thirty years after, does not annul the promise, so as to abolish it. 18 For if the inheritance is of Law, it is no more of promise; but God has given it to Abraham through promise. 19 Why the Law then? It was for the sake of transgressions, until the Seed should come, to whom it had been promised, being ordained through angels in a mediator's hand. 20 But the Mediator is not of one, but God is one. 21 Then is the Law against the promises of God? Let it not be! For if a law had been given which had been able to make alive, indeed righteousness would have been out of Law. 22 But the Scripture locked up all under sin, that the promise by faith of Jesus Christ might be given to the ones believing. 23 But before the coming of faith, we were guarded under Law, having been locked up to the faith being about to be revealed. 24 So that the Law has become a trainer of us until Christ, that we might be justified by faith. 25 But faith coming, we are no longer under a trainer; 26 for you are all sons of God through faith in Christ Jesus. 27 For as many as were baptized into Christ, you put on Christ. 28 There cannot be Jew nor Greek, there is no slave nor freeman, there is no male and female; for you are all one in Christ Jesus. 29 And if you are of Christ, then you are a seed of Abraham, even heirs according to promise.