Midrasch zu Schemot 7:26

And at the end of two years the Lord sent Moses once more unto Pharaoh, to bring forth the ‎children of Israel and to send them away from the land of Egypt; and Moses came to the ‎house of Pharaoh and he spoke unto him according to the words of the Lord, but Pharaoh ‎would not hearken unto the voice of Jehovah, and the Lord concluded to show his might in ‎Egypt, on Pharaoh and his servants. And God smote Pharaoh and his people with very terrible ‎plagues, and he turned by the hands of Aaron all the waters of Egypt into blood, and when an ‎Egyptian came to drink and drew water and he looked into his pitcher, behold it was turned ‎into blood, and also when a woman kneaded her bread or cooked her meals, all had the ‎appearance of blood. And the Lord sent again, and he caused all the waters to produce frogs, ‎so that the frogs came into the houses of the Egyptians, and when the Egyptians drank the ‎water, their stomachs were filled with frogs, and they leaped within them like in the river. And ‎all the water they used for cooking and drinking turned into frogs, and when they lay upon ‎their beds, they perspired frogs from their body. But for all that the anger of the Lord did not ‎turn from them, and his hand was still out stretched upon all Egypt, to smite them with all the ‎terrible plagues; and he sent and turned their dust into lice, so that the ground of Egypt was ‎covered with lice two cubits in height. And the lice were also upon the flesh of man and beast ‎among all the people of Egypt, and also upon the king and the queen, and Egypt was greatly ‎afflicted on account of the lice. But for all that the anger of the Lord did not turn, and his hand ‎was still outstretched over Egypt, and the Lord sent all the beasts of the field, and they came ‎and destroyed man and beast, and the trees, and all that was in Egypt. Then the Lord sent fiery ‎serpents, and scorpions, and mice, and rats, and weasels, and other vermin, that creepeth in ‎the dust, as also flies and fleas and all sorts of insects, and they came and tortured the ‎Egyptians, entering even their eyes and their ears. Then the hornets came over them also, and ‎they drove them to hide in their innermost chambers, and the Egyptians had to hide ‎themselves from the swarms of vermin and they locked the doors after them. But the Lord ‎commanded the Tulzoth, the great monster of the sea to come up and invade Egypt; and she ‎had very long arms, ten cubits in length according to the cubits of a man, and she went up and ‎unroofed their houses, and she put forth her arms into the houses and removed the bolts and ‎bars and opened the houses of the Egyptians, and the swarm of animals filled the houses of ‎the Egyptians, to torture them exceedingly.‎