Exodus 9:1-4

Then the LORD said to Moses, “Go to Pharaoh and say to him, ‘This is what the LORD, the God of the Hebrews, says: “Let my people go, so that they may worship me.” If you refuse to let them go and continue to hold them back, the hand of the LORD will bring a terrible plague on your livestock in the field—on your horses, donkeys and camels and on your cattle, sheep and goats. But the LORD will make a distinction between the livestock of Israel and that of Egypt, so that no animal belonging to the Israelites will die.’ ”