The book of the genealogy of Jesus Christ, the son of David, the son of Abraham.
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Chromatius of Aquileia
Therefore St. Matthew began writing his Gospel with an introduction of this sort, saying, “This is the book of Jesus Christ, descendant of David, descendant of Abraham. Abraham begot Isaac, Isaac begot Jacob,” and the rest that follows. Matthew, as I have said, tells of the second birth of the Lord into flesh and for this reason traces his family line from Abraham, treating separately the tribe of Judah, until he comes down to Joseph and Mary. Since the Evangelist begins from Abraham by succession of birth and recounts in order the names of all, one may wonder why he calls Christ our Lord only the descendant of David and the descendant of Abraham in saying, “This is the book of the lineage of Jesus Christ, Son of David, Son of Abraham.” At any rate, we know that the Evangelist did not say this without reason and in this order. Each of them, both Abraham and David, whether by the promise of the Lord or rank of birth, lived as a worthy predecessor in the line of Jesus Christ as to his existence in flesh. For the Lord had promised to Abraham, who by right of circumcision was the founding patriarch of the Jewish people, that from his seed all nations would be blessed. This was realized in Christ, who received his body from the line of Abraham. The apostle made an interpretation for the Galatians about this, saying, “Now the promises were made to Abraham and to his offspring. It does not say, ‘And to offsprings,’ referring to many; but, referring to one, ‘And to your offspring,’ which is Christ.” So also is David first among the tribe of Judah in the rank of king. And likewise God promised to this very tribe that the eternal king, Christ the Lord, would be born from the fruit of its womb. For David was the first king from the tribe of Judah, from which the Son of God received his flesh. Thus Matthew rightly counted Christ our Lord as the descendant of David and Abraham, because both Joseph and Mary are descended from these regal origins, the line of David, who himself descended from Abraham, who in faith lived as the father of nations and in flesh was the first of the Jewish people.