Romans 4
2 Ref For if Abraham was justified by works, he has something to boast about, but not toward God.
3 Ref For what does the Scripture say? "Abraham believed God, and it was accounted to him for righteousness."
4 Ref Now to him who works, the reward is not counted as grace, but as debt.
5 Ref But to him who doesn't work, but believes in him who justifies the ungodly, his faith is accounted for righteousness.