Wlastow G.K.
Many scholars interpret this passage to signify that for a period of seven days, the river was struck, rendering its waters undrinkable, and the second judgment occurred directly after the first.
And seven days were fully ended, after that the Lord struck the river.
וַיִּמָּלֵ֖א שִׁבְעַ֣ת יָמִ֑ים אַחֲרֵ֥י הַכּוֹת־יְהוָ֖ה אֶת־הַיְאֹֽר׃
One Church Father comments on this verse
Many scholars interpret this passage to signify that for a period of seven days, the river was struck, rendering its waters undrinkable, and the second judgment occurred directly after the first.
Passages read together with this verse.