Exodus 7:19

אמר אל אהרן SAY UNTO AARON — Because the river had protected Moses when he was cast into it, therefore it was not smitten by him neither at the plague of blood nor at that of frogs, but it was smitten by Aaron (Exodus Rabbah 9:10). נהרתם THEIR STREAMS — These are the flowing rivers, just like our rivers in France. יאריהם — These are canals which convey water being made by human agency and extending from the river bank into the fields. The waters of the Nile increase in volume and rise by way of these canals and so irrigate the fields. אגמיהם — A collection of waters that neither spring up from beneath the ground nor flow along, but which remain in one spot. In old French they call it étang. בכל ארץ מצרים [THERE WILL BE BLOOD] THROUGHOUT ALL THE LAND OF EGYPT— also in their bathing establishments and in the baths in their houses. ובעצים ובאבנים — the water which happened to be BOTH IN vessels of WOOD AND in vessels of STONE.

וַיֹּ֨אמֶר יְהֹוָ֜ה אֶל־מֹשֶׁ֗ה אֱמֹ֣ר אֶֽל־אַהֲרֹ֡ן קַ֣ח מַטְּךָ֣ וּנְטֵֽה־יָדְךָ֩ עַל־מֵימֵ֨י מִצְרַ֜יִם עַֽל־נַהֲרֹתָ֣ם ׀ עַל־יְאֹרֵיהֶ֣ם וְעַל־אַגְמֵיהֶ֗ם וְעַ֛ל כׇּל־מִקְוֵ֥ה מֵימֵיהֶ֖ם וְיִֽהְיוּ־דָ֑ם וְהָ֤יָה דָם֙ בְּכׇל־אֶ֣רֶץ מִצְרַ֔יִם וּבָעֵצִ֖ים וּבָאֲבָנִֽים׃

And the Lord spoke to Moshe, Say to Aharon, Take thy rod, and stretch out thy hand upon the waters of Miżrayim, upon their streams, upon their canals, and upon their ponds, and upon all their pools of water, that they may become blood; and that there may be blood throughout all the land of Miżrayim, both in vessels of wood, and in vessels of stone.