Romans 4:2-5 NIV

[2] If, in fact, Abraham was justified by works, he had something to boast about—but not before God. [3] What does Scripture say? “Abraham believed God, and it was credited to him as righteousness.” [4] Now to the one who works, wages are not credited as a gift but as an obligation. [5] However, to the one who does not work but trusts God who justifies the ungodly, their faith is credited as righteousness.