Exodus 9:6-8

Amplified Bible

⁶ And the Lord did this thing the next day, and all [kinds of] the livestock of Egypt died; but of the livestock of the Israelites, not one died. ⁷ Then Pharaoh sent [men to investigate], and not even one of the livestock of the Israelites had died. But the heart of Pharaoh was hardened [and his mind was firmly set], and he did not let the people go.

The Plague of Boils

⁸ Then the Lord said to Moses and Aaron, “Take handfuls of soot from the brick kiln, and let Moses throw it toward the sky in the sight of Pharaoh.