Komentarz do Wyjścia 12:30

ויקם פרעה AND PHARAOH AROSE from his bed,

FOR THERE WAS NOT A HOUSE WHERE THERE WAS NOT ONE DEAD. Rashi comments: “If there was a firstborn there, he died; if there was no firstborn there, the chief person in the house died because he is called b’chor (firstborn), as it is said, I also will appoint him firstborn.²⁷⁵Psalms 89:27. Another interpretation: The Egyptian women led dissolute lives under their husbands and bore children from unmarried young men. Thus they had many firstborn sons, sometimes [as many as] five to one woman, each one being the firstborn to his own father.”
In line with the plain meaning of Scripture, the firstborn that died in Egypt were the firstborn of their mothers, and this is why He sanctified in their place all the firstborn, whatsoever openeth the womb among the children of Israel, both of man and of beast.²⁷⁶Further, 13:2. The firstborn of Pharaoh that sat on his throne²⁷⁷Verse 29. was the firstborn to his mother. And such indeed is the custom among kings that the reigning mistress be a virgin, something like it is said in the case of Ahasuerus.²⁷⁸Esther 2:3. But in accordance with the opinion of our Rabbis [who say that the firstborn of a father also died], we shall explain that in Egypt, He smote all their firstborn. That is to say, the firstborn of the father, since he is the first-fruit of his strength,²⁷⁹See Genesis 49:3. and the firstborn of the mother, since he opened the womb, and also the chief person in the house. Yet it was His desire to sanctify in Israel in their place only the firstborn of the mother, because that is a matter more known and of open knowledge. In cattle, only the firstborn of the mother is known at all, and therefore He chose from among all of them only [the firstborn of the mother]. A sort of proof for this [statement of the Rabbis that the firstborn of the father was also smitten] is the verse: And He smote all the firstborn in Egypt, the first-fruits of their strength in the tents of Ham,²⁸⁰Psalms 78:51. for such an expression, [i.e., the first-fruits of his strength], is said only of a male.

ויקם פרעה לילה, Pharaoh rose up during the night, etc. The reason that the Torah mentions "at night," something that was obvious, is that according to the Zohar 2, page 38 that night was as bright as daylight. I have already found an allusion to this fact in Exodus 13,8 where the Torah instructs the Jewish father to tell his sons about the happenings during that night ביום ההוא, "on that day." The Torah means that the father should not fail to mention that one of the things that occurred during that night was that the night turned into day. In the event that we would think that the daylight during that night shone for both the Egyptians and the Israelites, the Torah emphasises that when Pharaoh rose he thought it was night because for him it was dark.