Exodus 9:10-12

Complete Jewish Bible

¹⁰ So they took ashes from a kiln, stood in front of Pharaoh and threw them in the air; and they became infected sores on men and animals. ¹¹ The magicians couldn’t even stand in Moshe’s presence because of the sores, which were on them as well as on the other Egyptians. ¹² But Adonai made Pharaoh hardhearted, so that he didn’t listen to them — just as Adonai had said to Moshe.