Over the land; over divers parts of the land, shaking his rod towards the several quarters of it. An east wind in those parts is a most violent and pernicious wind, Exodus 14:21 Numbers 11:31, and a dry wind, and therefore fit for the engendering of those creatures. This wind brought them from Arabia, where they are in great numbers, as we have seen, Exodus 10:12, though God miraculously increased their numbers, and their power of doing mischief.
Related Commentaries of Exodus 10:13
Exodus 10:13
13 And Moses stretched forth his rod over the land of Egypt, and the LORD brought an east wind upon the land all that day, and all that night; and when it was morning, the east wind brought the locusts.