Exodus 9:1-3

Then the LORD said to Moses, “Go to Pharaoh and speak to him, ‘Thus says the LORD, the God of the Hebrews, “Let My people go, that they may serve Me. For if you refuse to let them go and continue to hold them, behold, the hand of the LORD will come with a very severe pestilence on your livestock which are in the field, on the horses, on the donkeys, on the camels, on the herds, and on the flocks.