5 Yahweh appointed a set time, saying, "Tomorrow Yahweh shall do this thing in the land."
*Minor differences ignored. Grouped by changes, with first version listed as example.
To-morrow the Lord shall do this - By thus foretelling the evil, he showed his prescience and power; and from this both the Egyptians and Hebrews must see that the mortality that ensued was no casualty, but the effect of a predetermined purpose in the Divine justice.
And the Lord appointed a set time,.... For the coming of this plague, that it might plainly appear it came from him, and was not owing to any natural cause:
saying, tomorrow the Lord shall do this thing in the land; thus giving him time and space, as he had often done before, to consider the matter well, repent of his obstinacy, and dismiss the people of Israel, and so prevent the plague coming upon the cattle, as threatened.
*More commentary available at chapter level.