But what is said to Abraham, “Know of a surety that thy seed shall be a stranger in a land not theirs, and they shall reduce them to servitude, and shall afflict them 400 years,” is most clearly a prophecy about the people of Israel which was to be in servitude in Egypt. Not that this people was to be in that servitude under the oppressive Egyptians for 400 years, but it is foretold that this should take place in the course of those 400 years. For as it is written of Terah the father of Abraham, “And the days of Terah in Haran were 205 years,”912 not because they were all spent there, but because they were completed there, so it is said here also, “And they shall reduce them to servitude, and shall afflict them 400 years,” for this reason, because that number was completed, not because it was all spent in that affliction. The years are said to be 400 in round numbers, although they were a little more—whether you reckon from this time, when these things were promised to Abraham, or from the birth of Isaac, as the seed of Abraham, of which these things are predicted. For, as we have already said above, from the seventy-fifth year of Abraham, when the first promise was made to him, down to the exodus of Israel from Egypt, there are reckoned 430 years, which the apostle thus mentions: “And this I say, that the covenant confirmed by God, the law, which was made 430 years after, cannot disannul, that it should make the promise of none effect.”913 So then these 430 years might be called 400, because they are not much more, especially since part even of that number had already gone by when these things were shown and said to Abraham in vision, or when Isaac was born in his father’s 100th year, twenty-five years after the first promise, when of these 430 years there now remained 405, which God was pleased to call 400. No one will doubt that the other things which follow in the prophetic words of God pertain to the people of Israel.
When it is added, “And when the sun was now setting there was a flame, and lo, a smoking furnace, and lamps of fire, which passed through between those pieces,” this signifies that at the end of the world the carnal shall be judged by fire. For just as the affliction of the city of God, such as never was before, which is expected to take place under Antichrist, was signified by Abraham’s horror of great darkness about the going down of the sun, that is, when the end of the world draws nigh—so at the going down of the sun, that is, at the very end of the world, there is signified by that fire the day of judgment, which separates the carnal who are to be saved by fire from those who are to be condemned in the fire. And then the covenant made with Abraham particularly sets forth the land of Canaan, and names eleven tribes in it from the river of Egypt even to the great river Euphrates. It is not then from the great river of Egypt, that is, the Nile, but from a small one which separates Egypt from Palestine, where the city of Rhinocorura is.
XXV
Of Sarah’s handmaid, Hagar, whom she herself wished to be Abraham’s concubine.
And here follow the times of Abraham’s sons, the one by Hagar the bond maid, the other by Sarah the free woman, about whom we have already spoken in the previous book. As regards this transaction, Abraham is in no way to be branded as guilty concerning this concubine, for he used her for the begetting of progeny, not for the gratification of lust; and not to insult, but rather to obey his wife, who supposed it would be a solace of her barrenness if she could make use of the fruitful womb of her handmaid to supply the defect of her own nature, and by that law of which the apostle says, “Likewise also the husband hath not power of his own body, but the wife,”914 could, as a wife, make use of him for childbearing by another, when she could not do so in her own person. Here there is no wanton lust, no filthy lewdness. The handmaid is delivered to the husband by the wife for the sake of progeny, and is received by the husband for the sake of progeny, each seeking, not guilty excess, but natural fruit. And when the pregnant bond woman despised her barren mistress, and Sarah, with womanly jealousy, rather laid the blame of this on her husband, even then Abraham showed that he was not a slavish lover, but a free begetter of children, and that in using Hagar he had guarded the chastity of Sarah his wife, and had gratified her will and not his own—had received her without seeking, had gone in to her without being attached, had impregnated without loving her—for he says, “Behold thy maid is in thy hands: do to her as it pleaseth thee”;915 a man able to use women as a man should—his wife temperately, his handmaid compliantly, neither intemperately!
XXVI
Of God’s attestation to Abraham, by which He assures him, when now old, of a son by the barren Sarah, and appoints him the father of the nations, and seals his faith in the promise by the sacrament of circumcision.
After these things Ishmael was born of Hagar; and Abraham might think that in him was fulfilled what God had promised him, saying, when he wished to adopt his home-born servant, “This shall not be thine heir; but he that shall come forth of thee,
