Deuteronomy 7:15

The diseases of Egypt — Such as the Egyptians were infected with, either commonly, or miraculously. It seems to refer not only to the plagues of Egypt, but to some other epidemic disease, which they remembered to have prevailed among the Egyptians, and by which God had chastised them for their national sins. Diseases are God's servants, which go where he sends them, and do what he bids them.