Pharaoh sent men to investigate and found that not even one of the animals of the Israelites had died. Yet his heart1 was unyielding and he would not let the people go.2
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 boils3 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 magicians4 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 heart5 and he would not listen6 to Moses and Aaron, just as the LORD had said to Moses.
References for Exodus 9:12
Then the LORD said to Moses, "Get up early in the morning, confront Pharaoh and say to him, 'This is what the LORD, the God of the Hebrews, says: Let my people go, so that they may worship7 me,
References for Exodus 9:13
or this time I will send the full force of my plagues against you and against your officials and your people, so you may know8 that there is no one like9 me in all the earth.
References for Exodus 9:14
For by now I could have stretched out my hand and struck you and your people10 with a plague that would have wiped you off the earth.
References for Exodus 9:15
But I have raised you up for this very purpose,11 that I might show you my power12 and that my name might be proclaimed in all the earth.
References for Exodus 9:16
You still set yourself against my people and will not let them go.