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כִּ֣י ׀ בַּפַּ֣עַם הַזֹּ֗את אֲנִ֨י שֹׁלֵ֜חַ אֶת־כׇּל־מַגֵּפֹתַי֙ אֶֽל־לִבְּךָ֔ וּבַעֲבָדֶ֖יךָ וּבְעַמֶּ֑ךָ בַּעֲב֣וּר תֵּדַ֔ע כִּ֛י אֵ֥ין כָּמֹ֖נִי בְּכׇל־הָאָֽרֶץ׃
For this time I will send all My plagues upon your person, and your courtiers, and your people, in order that you may know that there is none like Me in all the world.
Shemos Rabbah 9:8 — EXTRA.
את כל מגפתי —\ldots זו מכת בכורות.
English: “All My plagues” — \ldots this is the plague of the firstborn.
Custom
Chazal identify “all My plagues” with the future plague of the firstborn.