Exodus 9:10-12

Holman Christian Standard Bible

¹⁰ So they took furnace soot and stood before Pharaoh. Moses threw it toward heaven, and it became festering boils on man and beast. ¹¹ The magicians could not stand before Moses because of the boils, for the boils were on the magicians as well as on all the Egyptians.^{(A) 12} But the Lord hardened Pharaoh’s heart^(B) and he did not listen to them, as the Lord had told Moses.