Exodus 9:1-3

Then the LORD told Moses, “Go to the king of Egypt and tell him, ‘This is what the LORD, the God of the Hebrews, says: Let my people go to worship me. If you refuse to let them go and continue to hold them, the LORD will punish you. He will send a terrible disease on your farm animals that are in the fields. He will cause your horses, donkeys, camels, cattle, goats, and sheep to become sick.