Exodus 9:1-7 NIV
1 Then the LORD said to Moses, “Go 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.”
2 If you refuse to let them go and continue to hold them back,
3 the hand of the LORD will bring a terrible plague on your livestock in the field—on your horses, donkeys and camels and on your cattle, sheep and goats.
4 But the LORD will make a distinction between the livestock of Israel and that of Egypt, so that no animal belonging to the Israelites will die.’”
5 The LORD set a time and said, “Tomorrow the LORD will do this in the land.”
6 And the next day the LORD did it: All the livestock of the Egyptians died, but not one animal belonging to the Israelites died.
7 Pharaoh investigated and found that not even one of the animals of the Israelites had died. Yet his heart was unyielding and he would not let the people go.