Exodus 1:7

Nevertheless, the sons of Israel were fruitful, and increased abundantly, and multiplied, and became exceedingly mighty, so that the land was filled with them.
Exodus 1:7 Modern English Version (MEV)
 
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And the children of Israel were fruitful. (8) To what an extent they increased Moses relates in the 12th chapter, viz., to the number of 600,000, besides women and children; which was certainly an incredible increase for so short a time. For, though 430 years be counted from the date of the covenant with Abraham to the departure of the people, it is clear that half of them had elapsed before Jacob went down into Egypt; so that the Israelites sojourned in that land only 200 years, or little more — say ten years more. How then could it come to pass that in so short a time a single family could have grown into so many myriads? It would have been an immense and extraordinary increase if 10,000 had sprung from every tribe; but this more than quadruples that number. Wherefore certain sceptics, perceiving that the relation of Moses surpasses the ordinary ratio of human propagation, and estimating the power of God by their own sense and experience, altogether refuse to credit it. For such is the perverseness of men, that they always seek for opportunities of despising or disallowing the works of God; such, too, is their audacity and insolence that they shamelessly apply all the acuteness they possess to detract from his glory. If their reason assures them that what is related as a miracle is possible, they attribute it to natural causes, — so is God robbed and defrauded of the praise his power deserves; if it is incomprehensible to them, they reject it as a prodigy. (9) But if they cannot bring themselves to acknowledge the interference of God except in matters by the magnitude of which they are struck with astonishment, why do they not persuade themselves of the truth of whatever common sense repudiates? They ask how this can be, as if it were reasonable that the hand of God should be so restrained as to be unable to do anything which exceeds the bounds of human comprehension. Whereas, because we are naturally so slow to profit by his ordinary operations, it is rather necessary that we should be awakened into admiration by extraordinary dealings.
 
Let us conclude, then, that since Moses does not here speak of the natural course of human procreation, but celebrates a miracle unheard of before, by which God ratified the truth of his promise, we should judge of it perversely, and maliciously, if we measure it by our own feeble reason, instead of meditating with reverence upon what far transcends all our senses. Let us rather remember how God reproves his unbelieving people by the Prophet Isaiah. ( Isa_51:1) For, in order to prove that it would not be difficult for Him, in spite of the small number to which the Israelites were reduced, to produce a great multitude, He bids them look into “the hole of the pit from whence they were digged,” viz., to Abraham, and Sarah that bare them, whom he multiplied though alone, and childless. Certain Rabbins, after their custom, imagine that four infants were produced at a birth; for as often as they meet with any point which perplexes them, they gratuitously invent whatever suits them, and then obtrude their imaginations as indubitable facts; and proceed foolishly, and unseasonably, to discuss that this is physically probable. There are Christians, too, who, with little consideration, have imitated them here, contending that what Moses describes is in accordance with experience, because the fecundity of certain nations has been almost as great. We indeed sometimes see confirmed by remarkable examples what the Psalmist says, ( Psa_107:36,) that God “maketh the hungry to dwell” in the wilderness, “that they may prepare a city for habitation, and sow the fields, and plant vineyards, which may yield fruits of increase; and he blesseth them also, so that they are multiplied greatly;” as also, that “He turneth a fruitful land into barrenness,” and strips it of inhabitants; but the design of Moses is to shew, that there never was any fecundity, which was not inferior to the increase of the people of Israel. Hence his comparison between the seventy souls, and the multitude which proceeded from them, that this special blessing of God might be distinguished from ordinary cases; hence too the accumulated expressions, which undoubtedly are meant for amplification, that “they were fruitful, and increased abundantly, and multiplied, and waxed exceeding mighty; and the land was filled with them.” For the repetition of the adverb, Meod, Meod, marks an unusual abundance, Nor do I reject the conjecture of some, that in the word שרף, sharatz, there is a metaphor taken from fishes, but I know not whether it is very sound, since the word is used generally for any multiplication.
 
(8) שרף, rendered in A V increased abundantly, — occurs first in Gen_1:20, where it is rendered bring forth abundantly As a noun it signifies reptiles. מאד, meod; in A V exceeding is repeated twice after עצמו, they waxed mighty; but may properly be considered as augmenting the force of each of the preceding verbs. — W
(9) French, “un monstre incroyable:” an incredible prodigy.
 
Calvin’s Complete Commentary
 
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