Exodus 9:1-3

Then the LORD said to Moses, “Go to Pharaoh and tell him, ‘Thus says the LORD, the God of the Hebrews: “Let My people go, so that they may serve Me. But if you refuse to let them go and continue to hold them, now hear this: the hand of the LORD will fall on your livestock which are out in the field, on the horses, the donkeys, the camels, the herds, and the flocks—a horrible plague shall come.