See the sources on a Google Sheet here
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What happened during ערב and how does the name inform us of the plague?
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What is the meaning of the words וְהִפְלֵיתִי and פְדֻת?
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What is the difference between
וְהִפְלֵיתִי בַיּוֹם הַהוּא אֶת אֶרֶץ גֹּשֶׁן אֲשֶׁר עַמִּי עֹמֵד עָלֶיהָ and וְשַׂמְתִּי פְדֻת בֵּין עַמִּי וּבֵין עַמֶּךָ?
4. What is the אות, and who is it for?
(יז) כִּ֣י אִם־אֵינְךָ֮ מְשַׁלֵּ֣חַ אֶת־עַמִּי֒ הִנְנִי֩ מַשְׁלִ֨יחַ בְּךָ֜ וּבַעֲבָדֶ֧יךָ וּֽבְעַמְּךָ֛ וּבְבָתֶּ֖יךָ אֶת־הֶעָרֹ֑ב וּמָ֨לְא֜וּ בָּתֵּ֤י מִצְרַ֙יִם֙ אֶת־הֶ֣עָרֹ֔ב וְגַ֥ם הָאֲדָמָ֖ה אֲשֶׁר־הֵ֥ם עָלֶֽיהָ׃
(יח) וְהִפְלֵיתִי֩ בַיּ֨וֹם הַה֜וּא אֶת־אֶ֣רֶץ גֹּ֗שֶׁן אֲשֶׁ֤ר עַמִּי֙ עֹמֵ֣ד עָלֶ֔יהָ לְבִלְתִּ֥י הֱיֽוֹת־שָׁ֖ם עָרֹ֑ב לְמַ֣עַן תֵּדַ֔ע כִּ֛י אֲנִ֥י יְהֹוָ֖ה בְּקֶ֥רֶב הָאָֽרֶץ׃
(יט) וְשַׂמְתִּ֣י פְדֻ֔ת בֵּ֥ין עַמִּ֖י וּבֵ֣ין עַמֶּ֑ךָ לְמָחָ֥ר יִהְיֶ֖ה הָאֹ֥ת הַזֶּֽה׃
(17) For if you do not let My people go, I will let loose swarms of insects*swarms of insects Others “wild beasts.” against you and your courtiers and your people and your houses; the houses of the Egyptians, and the very ground they stand on, shall be filled with swarms of insects.
(18) But on that day I will set apart the region of Goshen, where My people dwell, so that no swarms of insects shall be there, that you may know that I יהוה am in the midst of the land.
(19) And I will make a distinction*distinction Meaning of peduth uncertain. between My people and your people. Tomorrow this sign shall come to pass.’”