The poor man died and was carried by the angels to Abraham's side.
Just as in the church we are said to be gathered to our people through Baptism, through the Gospel and the sacraments, and we know that we are among our people, so when we die in the promise of Christ made to Abraham, we are transferred by the angels into the bosom of Abraham, or to our people. And we have often stated that the promises of the fathers pertain to the resurrection and the future life, not only to physical life but to the other, spiritual and eternal life, when the works of natural life, of nourishing, of generation, and similar works will cease. But where that people is, we do not know. . .. It suffices for us that Scripture testifies that from the beginning of the world those who believed in the Seed of the woman did not perish and were not consigned to oblivion but were gathered to their people.
From Lectures on Genesis (Luther's Works 8:315-16)