Comentario sobre Exodo 7:20
וַיַּֽעֲשׂוּ־כֵן֩ מֹשֶׁ֨ה וְאַהֲרֹ֜ן כַּאֲשֶׁ֣ר ׀ צִוָּ֣ה יְהוָ֗ה וַיָּ֤רֶם בַּמַּטֶּה֙ וַיַּ֤ךְ אֶת־הַמַּ֙יִם֙ אֲשֶׁ֣ר בַּיְאֹ֔ר לְעֵינֵ֣י פַרְעֹ֔ה וּלְעֵינֵ֖י עֲבָדָ֑יו וַיֵּהָֽפְכ֛וּ כָּל־הַמַּ֥יִם אֲשֶׁר־בַּיְאֹ֖ר לְדָֽם׃
Y Moisés y Aarón hicieron como SEÑOR lo mandó; y alzando la vara hirió las aguas que había en el río, en presencia de Faraón y de sus siervos; y todas las aguas que había en el río se convirtieron en sangre.
Ramban on Exodus
AND HE LIFTED UP THE ROD, AND SMOTE THE WATERS THAT WERE IN THE RIVER IN THE SIGHT OF PHARAOH. That is to say, Aaron lifted up the rod and stretched out his hand over the land of Egypt in all directions,125Ramban’s intent is to state that the lifting up of the rod, mentioned here in Verse 20, is identical with “stretch out thy hand,” mentioned in G-d’s command in Verse 19. Ibn Ezra, as stated further in the text, differs with this opinion. and afterwards he smote the waters that were in the river, in the sight of Pharaoh. In Pharaoh’s sight, all the waters that were in the river turned to blood, and the blood was furthermore throughout all the land of Egypt.126Verse 21. Ramban thus explains that the waters that were in the river turned to blood by reason of the smiting of the rod, while the waters in all other places turned into blood by reason of Aaron’s stretching forth his hand in all directions (Bachya). And Rabbi Abraham ibn Ezra said that Scripture mentioned the smiting of the river but found it unnecessary to mention the stretching out of the hand [in all directions] over the entire land of Egypt.127Thus according to Ibn Ezra, Scripture merely shortened its account here and did not mention the stretching out of Aaron’s hand, but not, as Ramban has it, that the stretching out of the hand is already included in the act of the smiting of the waters of the river.
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Rashbam on Exodus
לעיני פרעה, this was a big boost for Moses’ stature, that Aaron, merely his messenger, was able to accomplish this and use his staff on a regular basis.
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Or HaChaim on Exodus
ויעשו כן משה ואהרן, Moses and Aaron did so precisely, etc. This means that when Moses and Aaron smote the river the result was that G'd's will was done and the result was the same as if G'd Himself had struck the river. Please read what I have already written on verse six concerning such expressions in the Torah, as well as what I shall be writing on the verse following.
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