Exodus 7:23

וְהַדָּגָה אֲשֶׁר־בַּיְאֹר מֵתָה וַיִּבְאַשׁ הַיְאֹר וְלֹא־יָכְלוּ מִצְרַיִם לִשְׁתּוֹת מַיִם מִן־הַיְאֹר וַיְהִי הַדָּם בְּכָל־אֶרֶץ מִצְרָֽיִם

And the fish that were in the river died; and the river became foul, and the Egyptians could not drink water from the river; and the blood was throughout all the land of Egypt.

וַיַּֽעֲשׂוּ־כֵן חַרְטֻמֵּי מִצְרַיִם בְּלָטֵיהֶם וַיֶּחֱזַק לֵב־פַּרְעֹה וְלֹא־שָׁמַע אֲלֵהֶם כַּאֲשֶׁר דִּבֶּר יְהוָֽה

And the magicians of Egypt did in like manner with their secret arts; and Pharaoh’s heart was hardened, and he hearkened not unto them; as the LORD had spoken.

וַיַּחְפְּרוּ כָל־מִצְרַיִם סְבִיבֹת הַיְאֹר מַיִם לִשְׁתּוֹת כִּי לֹא יָֽכְלוּ לִשְׁתֹּת מִמֵּימֵי הַיְאֹֽר

And all the Egyptians digged round about the river for water to drink; for they could not drink of the water of the river.

וַיִּמָּלֵא שִׁבְעַת יָמִים אַחֲרֵי הַכּוֹת־יְהוָה אֶת־הַיְאֹֽר

And seven days were fulfilled, after that the LORD had smitten the river.