ISB ~ Galatians 3 v6

Abraham:The great-grandfather of Israel by race and the father of all believers by grace. Paul sees the gospel of justification proclaimed in the life of Abraham, who was righteous by faith completely apart from his circumcision (Rom 4:9-12).

believed God:A citation from Gen 15:6.

• This was a time of testing for Abraham, when God was stretching his faith in a moment of discouragement (1 Mac 2:52). Though faced with formidable obstacles, such as his age and the barrenness of his wife, he trusted that God could do the impossible by giving him a son. The promise was later fulfilled in the birth of Isaac (Gen 21:1-3). It is clear from the context of Genesis, as well as Heb 11:8-12, that this is not the moment of Abraham’s conversion, for it is not the first time he puts his faith in the Lord. For details, See note on Gen 15:6.