Genesis 15:12

mention has already been made of a vision: Moses now relates, that a dream was superadded. A horrible darkness intervened, that Abram might know that the dream is not a common one, but that the whole is divinely conducted; it has, nevertheless, a correspondence with the oracle then present, as God immediately afterwards explains in his own words, “Thou shalt surely know that thy seed shall be a stranger,” etc. We have elsewhere said, that God was not wont to dazzle the eyes of his people with bare and empty spectres; but that in visions, the principal parts always belonged to the word. Thus here, not a mute apparition is presented to the eyes of Abram, but he is taught by an oracle annexed, what the external and visible symbol meant. It is, however, to be observed, that before one son is given to Abram, he hears that his seed shall be, for a long time, in captivity and slavery. For thus does the Lord deal with his own people; he always makes a beginning from death, so that by quickening the dead, he the more abundantly manifests his power. It was necessary, in part, on Abram’s account, that this should have been declared; but the Lord chiefly had regard to his posterity, lest they should faint in their sufferings, of which, however, the Lord had promised a joyful and happy issue; especially since their long continuance would produce great weariness. And three things are, step by step, brought before them; first, that the sons of Abram must wander four hundred years, before they should attain the promised inheritance; secondly, that they should be slaves; thirdly that they were to be inhumanly and tyrannically treated. Wherefore the faith of Abram was admirable and singular, seeing that he acquiesced in an oracle so sorrowful, and felt assured, that God would be his Deliverer, after his miseries had proceeded to their greatest height.

It is, however, asked, how the number of years here given agrees with the subsequent history? Some begin the computation from the time of his departure out of Charran. But it seems more probable that the intermediate time only is denoted; as if he would say, ‘It behoves thy posterity to wait patiently; because I have not decreed to grant what I now promise, until the four hundredth year: yea, up to that very time their servitude will continue.’ According to this mode of reckoning, Moses says, (Exodus 12:40,) that the children of Israel dwelt in Egypt four hundred and thirty years: while yet, from the sixth chapter (Genesis 6:1,) we may easily gather, that not more than two hundred and thirty years, or thereabouts, elapsed from the time that Jacob went down thither, to their deliverance. Where then, shall we find the remaining two hundred years, but by referring to the oracle? Of this matter all doubt is removed by Paul, who (Galatians 3:17) reckons the years from the gratuitous covenant of life, to the promulgation of the Law. In short, God does not indicate how long the servitude of the people should be from its commencement to its close, but how long he intended to suspend, or to defer his promise. As to his omitting the thirty years, it is neither a new nor unfrequent thing, where years are not accurately computed, to mention only the larger sums. But we see here, that for the sake of brevity, the whole of that period is divided into four centuries. Therefore, there is no absurdity in omitting the short space of time: this is chiefly to be considered, that the Lord, for the purpose of exercising the patience of his people, suspends his promise more than four centuries.