Page:Keil and Delitzsch,Biblical commentary the old testament the pentateuch, trad James Martin, volume 1, 1885.djvu/481

 It is true, there is still the possibility that this verse may be connected with the following one, “when seven days were fulfilled...Jehovah said to Moses.” But this is not probable; for the time which intervened between the plagues is not stated anywhere else, nor is the expression, “Jehovah said,” with which the plagues are introduced, connected in any other instance with what precedes. The narrative leaves it quite undecided how rapidly the plagues succeeded one another. On the supposition that the changing of the Nile water took place at the time when the river began to rise, and when the reddening generally occurs, many expositors fix upon the month of June or July for the commencement of the plague; in which case all the plagues down to the death of the first-born, which occurred in the night of the 14th Abib, i.e., about the middle of April, would be confined to the space of about nine months. But this conjecture is a very uncertain one, and all that is tolerably sure is, that the seventh plague (the hail) occurred in February (vid., Exo 9:31-32), and there were (not three weeks, but) eight weeks therefore, or about two months, between the seventh and tenth plagues; so that between each of the last three there would be an interval of fourteen or twenty days. And if we suppose that there was a similar interval in the case of all the others, the first plague would take place in September or October-that is to say, after the yearly overflow of the Nile, which lasts from June to September. =Chap. 8=

verses 1-6
The plague of Frogs, or the second plague, also proceeded from the Nile, and had its natural origin in the putridity of the slimy Nile water, whereby the marsh waters especially became filled with thousands of frogs. צפרדּע is the small Nile frog, the Dofda of the Egyptians, called rana Mosaica or Nilotica by Seetzen, which appears in large numbers as soon as the waters recede. These frogs (הצּפרדּע in Exo 8:6, used collectively) became a penal miracle from the fact that they came out of the water in unparalleled numbers, in consequence of the stretching out of Aaron's staff over the waters of the Nile, as had been foretold to the king, and that they not only penetrated into the houses and inner rooms (“bed-chamber”), and crept into the domestic utensils, the beds (מטּה), the ovens, and the kneading-troughs (not the “dough” as Luther renders it), but even got upon the men themselves.

verses 7-9
This