Exodus 9:5

1 Then the LORD said to Moses, “Go to Pharaoh and tell him that this is what the LORD, the God of the Hebrews, says: ‘Let My people go, so that they may worship Me.

2 But if you continue to restrain them and refuse to let them go,

3 then the hand of the LORD will bring a severe plague on your livestock in the field—on your horses, donkeys, camels, herds, and flocks.

4 But the LORD will make a distinction between the livestock of Israel and the livestock of Egypt, so that no animal belonging to the Israelites will die.’”

5 The LORD set a time, saying, “Tomorrow the LORD will do this in the land.”

6 And the next day the LORD did just that. All the livestock of the Egyptians died, but not one animal belonging to the Israelites died.

7 Pharaoh sent officials and found that none of the livestock of the Israelites had died. But Pharaoh’s heart was hardened, and he would not let the people go.

8 Then the LORD said to Moses and Aaron, “Take handfuls of soot from the furnace; in the sight of Pharaoh, Moses is to toss it into the air.

9 It will become fine dust over all the land of Egypt, and festering boils will break out on man and beast throughout the land.”

Read all of Exodus 9