Romans 4:1-12
Paul’s question (4:1) is intriguing: How, exactly, was Abraham justified by God? The Jews had grown so accustomed to thinking that adherence to the law was the way to God’s favor that they could hardly conceive of any other way. But by using Abraham—someone they all had the highest respect for—as an example Paul transports them to a time more than four centuries before God had provided the law. If Abraham could find God’s favor without the law, so could other people.
To have something credited means the recipient does nothing to earn what is received—just the opposite of working to get a paycheck (4:4–5).
Paul’s first-century readers would have been more familiar with the facts of the story (4:9–10) than most modern readers, so he didn’t need to spell out for them that God had declared Abraham righteous prior to the birth of Ishmael, at which time he was eighty-six (Genesis 16:16). Yet God did not instruct Abraham to receive the mark of circumcision until just prior to the birth of Isaac, when the patriarch was ninety-nine (Genesis 17:1, 11; 21:5). So Abraham’s circumcision had no direct connection to his righteousness before God.
There was no problem with circumcision being a sign of Jewishness, and the Jews could continue to honor Abraham as their father (4:12). But circumcision was not proof of a person’s righteous standing before God, and Abraham was also to be the father of those who came to God by faith and were not circumcised (4:11).