5 I have already given what I considered a sufficient answer to Faustus' calumnies of the lives of the patriarchs. That they were punished at their death, or that they were justified after the Lord's passion, is not what we learn from His commendation of them, when He admonished the Jews that, if they were Abraham's children, they should do the works of Abraham, and said that Abraham desired to see His day, and was glad when he saw it; and that it was into his bosom, that is, some deep recess of blissful repose, that the angels carried the poor sufferer who was despised by the proud rich man. And what are we to make of the Apostle Paul? Is there any idea of justification after death in his praise of Abraham, when he says that before he was circumcised he believed God, and that it was counted to him for righteousness? And so much importance does he attach to this, that the single ground which he specifies for our becoming Abraham's children, though not descended from him in the flesh, is, that we follow the footsteps of his faith.
Source: Reply to Faustus the Manichaean (New Advent)