Exodus 9:1-4

1Then the Lord said to Moses, “Go in 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.

2But if you refuse to let them go and keep holding them,

3then the Lord’s hand will bring a severe plague against your livestock in the field — the 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 nothing of all that the Israelites own will die.”