If you refuse to let them go and continue to hold them back,
the hand1 of the LORD will bring a terrible plague2 on your livestock in the field--on your horses and donkeys and camels and on your cattle and sheep and goats.
References for Exodus 9:3
But the LORD will make a distinction between the livestock of Israel and that of Egypt,3 so that no animal belonging to the Israelites will die.' "
References for Exodus 9:4
The LORD set a time and said, "Tomorrow the LORD will do this in the land."
And the next day the LORD did it: All the livestock4 of the Egyptians died,5 but not one animal belonging to the Israelites died.
References for Exodus 9:6
Pharaoh sent men to investigate and found that not even one of the animals of the Israelites had died. Yet his heart6 was unyielding and he would not let the people go.7
References for Exodus 9:7
Then the LORD said to Moses and Aaron, "Take handfuls of soot from a furnace and have Moses toss it into the air in the presence of Pharaoh.
References for Exodus 9:8
It will become fine dust over the whole land of Egypt, and festering boils8 will break out on men and animals throughout the land."
References for Exodus 9:9
So they took soot from a furnace and stood before Pharaoh. Moses tossed it into the air, and festering boils broke out on men and animals.
The magicians9 could not stand before Moses because of the boils that were on them and on all the Egyptians.
References for Exodus 9:11
But the LORD hardened Pharaoh's heart10 and he would not listen11 to Moses and Aaron, just as the LORD had said to Moses.
References for Exodus 9:12