Exodus 9:1-4

1Then the LORD said to Moses, “Go to Pharaoh and tell him that this is what the LORD, the God of the Hebrews, says: ‘Let My people go, so that they may worship Me. 2But if you continue to restrain them and refuse to let them go, 3then the hand of the LORD will bring a severe plague on your livestock in the field—on your horses, donkeys, camels, herds, and flocks. 4But the LORD will make a distinction between the livestock of Israel and the livestock of Egypt, so that no animal belonging to the Israelites will die.’”