Parashas Vaeira · Side page (no TT primary unit)
כֹּ֚ה אָמַ֣ר יְהֹוָ֔ה בְּזֹ֣את תֵּדַ֔ע כִּ֖י אֲנִ֣י יְהֹוָ֑ה הִנֵּ֨ה אָנֹכִ֜י מַכֶּ֣ה ׀ בַּמַּטֶּ֣ה אֲשֶׁר־בְּיָדִ֗י עַל־הַמַּ֛יִם אֲשֶׁ֥ר בַּיְאֹ֖ר וְנֶהֶפְכ֥וּ לְדָֽם׃
Thus says GOD, “By this you shall know that I am GOD.” See, I shall strike the water in the Nile with the rod that is in my hand, and it will be turned into blood;
Shemos Rabbah 7:5 — EXTRA.
ונהפכו לדם —\ldots מדה כנגד מדה, ששפכו דם ישראל.
English: “And they shall turn to blood” — \ldots measure for measure, for they spilled the blood of Israel.
Custom
Chazal teach that the plague of blood was measure-for-measure for the blood of the infants.