Paul continues with his questions. What better example of a good man could there be than Abraham, the father of the Jews! Paul homes in on what the scripture says about him.
Was Abraham credited with righteousness because he kept God’s commandments? Undoubtedly, he did keep them very well. But did that make him righteous? The answer is ‘No!’.
What the text says is that he believed what God had said. This was when Abraham had been married for many years, but still had no children. The angel took him out to look at the night sky. ‘Count the stars!’, he said, ‘that is how many offspring you will have!’ And Abraham believed God’s promise. At that point the scripture says his belief was counted for righteousness Genesis 15:6.
When God justifies (declares sinless) a sinner, this is not a reward for obedience. It is a gift. Because he has shown faith in God, he can be counted righteous even though he was a sinner.
Now Paul invokes the case of David, another patriarch of the Jews. He had become a notorious sinner through his adultery with Bathsheba and the death of Uriah. He wrote Psalm 32 to record how God forgave him when he confessed his sin. There was nothing he could do to earn forgiveness. No sacrifice he could offer could atone for such iniquity. It was God’s mercy that spared him Psalm 32:1–2. Once he asked for forgiveness, his sins were covered by God’s grace, just as sinful Adam’s nakedness was covered by the skin of a slain animal in Genesis 3:21.
The Jews in the Roman congregation were proud of the fact they had been circumcised on the eighth day. It is time for another question. Does the ascription of righteousness because of faith belong only to people who have been circumcised? Paul checks the case of Father Abraham. When God said he was righteous because he had faith, was it after he was circumcised? The answer is ‘No! ’. He was only circumcised many years after God counted him righteous. You can work this out from the fact that it is in Genesis 15 that he showed his faith in the promise. In the next chapter his wife Sarah persuaded him to have a child by her handmaid. It says he was then 86 years old (Genesis 16:16). But he was not circumcised until he was 99 (Genesis 17:24).
So, Paul argues, circumcision did not make him righteous. It was only a sign of a righteousness Abraham already had. On that basis, Gentiles who have not been circumcised can also be counted righteous, so long as they have faith.