Exodus 9:1-4

1Then the Lord said to Moses, “Go to Pharaoh and tell him, ‘Thus says the Lord, the God of the Hebrews, “Release my people that they may serve me!

2For if you refuse to release them and continue holding them,

3then the hand of the Lord will surely bring a very terrible plague on your livestock in the field, on the horses, the donkeys, the camels, the herds, and the flocks.

4But the Lord will distinguish between the livestock of Israel and the livestock of Egypt, and nothing will die of all that the Israelites have.”’”