Genesis 15:6

And he believed in the Lord; and he counted it to him for righteousness. Cf Romans 4:5. Abram placed his trust in the promise of the Lord with all it implied, and therefore the Lord accepted him into the covenant of His grace. That is the way of salvation for all sinners, the way of obtaining that true righteousness by which we are justified before God. Christ has earned blessing, salvation, righteousness for all men, and all that accept this promise in faith have these wonderful gifts, are pure, holy, and righteous before God, because the righteousness of Christ is imputed to them.