3 However, what does Scripture say? "Abraham trusted God, and so he was considered as being a good person who did right."4:3. Quoting Genesis 15:6.
9 Now is this blessing just for the Jews, or is it for others too? We’ve just stated that Abraham was accepted as good and right because he trusted God. 10 But when did this happen? When Abraham was a Jew or before? 11 It was actually before he became a Jew by being circumcised, which was a confirmation of his trust in God to make him right. This happened before he was circumcised, so he is the father of everyone who trusts in God and are considered as right by God, even though they may not be circumcised Jews.
16 So the promise is based on trusting God. It is provided as a free gift, guaranteed to all the children of Abraham—not merely to those who follow the law,4:16. Paul is not saying here that those who obey the Mosaic law are consequently made right with God—he has already dealt with that issue. He is simply pointing out that those who are not following the Mosaic law are not excluded by God. but also to those who trust like Abraham, the father of us all. 20 He held on to God’s promise—he didn’t doubt it. Instead his trust in God grew stronger, and he gave glory to God. 21 He was totally convinced that what God had promised he had the power to deliver.