Romans 4:4-5

4:4 Now to the one who works, his pay is not credited due to grace but due to obligation. 4:5 But to the one who does not work, but believes in the one who declares the ungodly righteous, his faith is credited as righteousness.

Romans 4:14

4:14 For if they become heirs by the law, faith is empty and the promise is nullified.

Romans 4:16

4:16 For this reason it is by faith so that it may be by grace, with the result that the promise may be certain to all the descendants – not only to those who are under the law, but also to those who have the faith of Abraham, who is the father of us all

Romans 9:30-32

Israel’s Rejection Culpable

9:30 What shall we say then? – that the Gentiles who did not pursue righteousness obtained it, that is, a righteousness that is by faith, 9:31 but Israel even though pursuing a law of righteousness did not attain it. 9:32 Why not? Because they pursued it not by faith but (as if it were possible) by works. They stumbled over the stumbling stone,

Romans 10:5-6

10:5 For Moses writes about the righteousness that is by the law: “The one who does these things will live by them.” 10:6 But the righteousness that is by faith says: “Do not say in your heart, ‘Who will ascend into heaven?’” (that is, to bring Christ down)

Romans 11:6

11:6 And if it is by grace, it is no longer by works, otherwise grace would no longer be grace.