The Epistle to Aristides 3Chapter III.

III. But in order that what I have said may be made evident, I shall explain the interchange of the generations. If we reckon the generations from David through Solomon, Matthan is found to be the third from the end, who begat Jacob the father of Joseph. But if, with Luke, we reckon them from Nathan the son of David, in like manner the third from the end is Melchi, whose son was Heli the father of Joseph. For Joseph was the son of Heli, the son of Melchi. As Joseph, therefore, is the object proposed to us, we have to show how it is that each is represented as his father, both Jacob as descending from Solomon, and Heli as descending from Nathan: first, how these two, Jacob and Heli, were brothers; and then also how the fathers of these, Matthan and Melchi, being of different families, are shown to be the grandfathers of Joseph. Well, then, Matthan and Melchi, having taken the same woman to wife in succession, begat children who were uterine brothers, as the law did not prevent a widow, whether such by divorce or by the death of her husband, from marrying another. By Estha, then--for such is her name according to tradition--Matthan first, the descendant of Solomon, begets Jacob; and on Matthan's death, Melchi, who traces his descent back to Nathan, being of the same tribe but of another family, having married her, as has been already said, had a son Heli. Thus, then, we shall find Jacob and Heli uterine brothers, though of different families. And of these, the one Jacob having taken the wife of his brother Heli, who died childless, begat by her the third, Joseph--his son by nature and by account. Whence also it is written, "And Jacob begat Joseph." But according to law he was the son of Heli, for Jacob his brother raised up seed to him. Wherefore also the genealogy deduced through him will not be made void, which the Evangelist Matthew in his enumeration gives thus: "And Jacob begat Joseph." But Luke, on the other hand, says, "Who was the son, as was supposed (for this, too, he adds), of Joseph, the son of Heli, the son of Melchi." For it was not possible more distinctly to state the generation according to law; and thus in this mode of generation he has entirely omitted the word "begat" to the very end, carrying back the genealogy by way of conclusion to Adam and to God.