Romans 4:1-8; Romans 4:11
What then shall we say that Abraham, our forefather, discovered in this matter?
If, in fact, Abraham was justified by works, he had something to boast about--but not before God.
What does the Scripture say? "Abraham believed God, and it was credited to him as righteousness."
Now when a man works, his wages are not credited to him as a gift, but as an obligation.
However, to the man who does not work but trusts God who justifies the wicked, his faith is credited as righteousness.
David says the same thing when he speaks of the blessedness of the man to whom God credits righteousness apart from works:
"Blessed are they whose transgressions are forgiven, whose sins are covered.
Blessed is the man whose sin the Lord will never count against him."
And he received the sign of circumcision, a seal of the righteousness that he had by faith while he was still uncircumcised. So then, he is the father of all who believe but have not been circumcised, in order that righteousness might be credited to them.