בָּרוּךְ אַתָּה יהוה אֱלהֵינוּ מֶלֶךְ הָעולָם אֲשֶׁר קִדְּשָׁנוּ בְּמִצְותָיו וְצִוָּנוּ לַעֲסוק בְּדִבְרֵי תורָה:
Blessed are You, Lord, our God, Ruler of the Universe, Who has sanctified us with mitzvot and commanded us to immerse ourselves within words of Torah.
וַיֹּ֨אמֶר יהוה אֶל־מֹשֶׁ֗ה נְטֵ֤ה יָֽדְךָ֙ עַל־הַשָּׁמַ֔יִם וִ֥יהִי חֹ֖שֶׁךְ עַל־אֶ֣רֶץ מִצְרָ֑יִם וְיָמֵ֖שׁ חֹֽשֶׁךְ׃ וַיֵּ֥ט מֹשֶׁ֛ה אֶת־יָד֖וֹ עַל־הַשָּׁמָ֑יִם וַיְהִ֧י חֹֽשֶׁךְ־אֲפֵלָ֛ה בְּכָל־אֶ֥רֶץ מִצְרַ֖יִם שְׁלֹ֥שֶׁת יָמִֽים׃ לֹֽא־רָא֞וּ אִ֣ישׁ אֶת־אָחִ֗יו וְלֹא־קָ֛מוּ אִ֥ישׁ מִתַּחְתָּ֖יו שְׁלֹ֣שֶׁת יָמִ֑ים וּֽלְכָל־בְּנֵ֧י יִשְׂרָאֵ֛ל הָ֥יָה א֖וֹר בְּמוֹשְׁבֹתָֽם׃
Then the LORD said to Moses, “Hold out your arm toward the sky that there may be darkness upon the land of Egypt, a darkness that can be touched.” Moses held out his arm toward the sky and thick darkness descended upon all the land of Egypt for three days. People could not see one another, and for three days no one could get up from where he was; but all the Israelites enjoyed light in their dwellings.
תַּנְיָא: רַבִּי מֵאִיר אוֹמֵר: מִשֶּׁיַּכִּיר בֵּין זְאֵב לְכֶלֶב. רַבִּי עֲקִיבָא אוֹמֵר: בֵּין חֲמוֹר לְעָרוֹד. וַאֲחֵרִים אוֹמְרִים: מִשֶּׁיִּרְאֶה אֶת חֲבֵרוֹ רָחוֹק אַרְבַּע אַמּוֹת, וְיַכִּירֶנּוּ.
It was taught in a baraita:
Rabbi Meir says that the day begins when one can distinguish between two similar animals, e.g., a wolf and a dog.Rabbi Akiva provides a different sign, and says that the day begins when there is sufficient light to distinguish between a donkey and a wild donkey.And Aḥerim say: When one can see another person, who is merely an acquaintance (Jerusalem Talmud) from a distance of four cubits and recognize him.
(יג) וְהָיָה֩ הַדָּ֨ם לָכֶ֜ם לְאֹ֗ת עַ֤ל הַבָּתִּים֙ אֲשֶׁ֣ר אַתֶּ֣ם שָׁ֔ם וְרָאִ֙יתִי֙ אֶת־הַדָּ֔ם וּפָסַחְתִּ֖י עֲלֵכֶ֑ם וְלֹֽא־יִֽהְיֶ֨ה בָכֶ֥ם נֶ֙גֶף֙ לְמַשְׁחִ֔ית בְּהַכֹּתִ֖י בְּאֶ֥רֶץ מִצְרָֽיִם׃
(13) And the blood on the houses where you are staying shall be a sign for you: when I see the blood I will pass over you, so that no plague will destroy you when I strike the land of Egypt.
(א)והיה הדם לכם לאת. לָכֶם לְאוֹת וְלֹא לַאֲחֵרִים לְאוֹת (שם). מִכָּאן שֶׁלֹּא נָתְנוּ הַדָּם אֶלָּא מִבִּפְנִים:
(1) והיה הדם לכם לאת AND THE BLOOD SHALL BE UNTO YOU FOR A SIGN — it shall be to you for a sign, and not to others for a sign (Mekhilta d'Rabbi Yishmael 12:13:1). From this we may learn that they put the blood only inside their houses.
(ח) וְהִגַּדְתָּ֣ לְבִנְךָ֔ בַּיּ֥וֹם הַה֖וּא לֵאמֹ֑ר בַּעֲב֣וּר זֶ֗ה עָשָׂ֤ה יהוה לִ֔י בְּצֵאתִ֖י מִמִּצְרָֽיִם׃(ט) וְהָיָה֩ לְךָ֨ לְא֜וֹת עַל־יָדְךָ֗ וּלְזִכָּרוֹן֙ בֵּ֣ין עֵינֶ֔יךָ לְמַ֗עַן תִּהְיֶ֛ה תּוֹרַ֥ת יהוה בְּפִ֑יךָ כִּ֚י בְּיָ֣ד חֲזָקָ֔ה הוֹצִֽאֲךָ֥ יהוה מִמִּצְרָֽיִם׃
(8) And you shall explain to your son on that day, ‘It is because of what the LORD did for me when I went free from Egypt.’(9) “And this shall serve you as a sign on your hand and as a reminder on your forehead—in order that the Teaching of the LORD may be in your mouth—that with a mighty hand the LORD freed you from Egypt.
וַיַּעשׂ יְהוֹשֻׁעַ כַּאֲשֶׁר אָמַר לוֹ מֹשֶׁה וְגוֹ', וְהָיָה כַּאֲשֶׁר יָרִים מֹשֶׁה וְגוֹ'. וְכִי יָדָיו שֶׁל מֹשֶׁה עוֹשׂוֹת מִלְחָמָה אוֹ שׁוֹבְרוֹת מִלְחָמָה. אֶלָּא כָּל זְמַן שֶׁיִּשְׂרָאֵל מִסְתַּכְּלִין כְּלַפֵּי מַעְלָה וּמְשַׁעְבְּדִין אֶת לִבָּן לַאֲבִיהֶם שֶׁבַּשָּׁמַיִם, הָיוּ מִתְגַּבְּרִין, וְאִם לָאו, הָיוּ נוֹפְלִין.
So Joshua did as Moses had said to him … and it came to pass, when Moses held up his hand (Exod. 17:10–11). Could the hand of Moses actually wage war or cause a war to cease? This indicates that whenever the Israelites glanced upward and directed their hearts to their Father in Heaven, they were strengthened, but if not, they were defeated.
לא ראו איש את אחיו ולא קם איש מתחתיו שלושת ימים“They did not see one another; no person rose above his lowest self for three days (10:23).” Read the second half of this verse in a very earthy way. “No one got up off his taḥat to help anyone else! The ninth plague may be taken to be one of moral blindness. Until then, we might say, the Egyptians still cared for one another. But after the hail and the locusts, when there was no green thing left to eat (10:15), they became so desperate that there was no longer any caring for one another; they did not see one another’s suffering.

