Romans 4:2-5

If, in fact, Abraham was justified by works, he had something to boast about – but not before God. What does Scripture say? ‘Abraham believed God, and it was credited to him as righteousness.’ Now to the one who works, wages are not credited as a gift but as an obligation. However, to the one who does not work but trusts God who justifies the ungodly, their faith is credited as righteousness.