Ezequiel 37:26

Multiply them. — In accordance with what has gone before, comes this promise of the great increase of the spiritual Israel. Even John the Baptist had said, “God is able of these stones to raise up children unto Abraham”; but our Lord more emphatically taught that the true children of Abraham were those who followed Him (João 8:39, &c.); while His Apostle St. Paul explains repeatedly, and at length, that Abraham was the father of all those who walk in his faith, whether they be of the circumcision or the uncircumcision (Romanos 4:12, &c.); and again, “that they which are of faith, the same are the children of Abraham” (Gálatas 3:7). Thus was fulfilled the promise that he should be “the father of many nations” (Gênesis 17:5, interpreted in Romanos 4:17), and in the same way also was to be fulfilled the present promise of the multiplication of the seed of Israel.