Exodus 9:3-7

behold, the hand of the Lord will come with a very severe plague on your livestock which are in the field, on the horses, on the donkeys, on the camels, on the herds, and on the flocks.

But the Lord will make a distinction between the livestock of Israel and the livestock of Egypt, so that nothing will die of all that belongs to the sons of Israel.” ’ ”

And the Lord set a definite time, saying, “Tomorrow the Lord will do this thing in the land.”

So the Lord did this thing on the next day, and all the livestock of Egypt died; but not one of the livestock of the sons of Israel died.

And Pharaoh sent men, and they learned that, behold, not even one of the livestock of Israel was dead. But the heart of Pharaoh was hardened, and he did not let the people go. The Plague of Boils