Shemot 9:8-10

Orthodox Jewish Bible

⁸ And Hashem said unto Moshe and unto Aharon, Take to you handfuls of piach of the furnace, and let Moshe sprinkle it toward Shomayim in the sight of Pharaoh.

⁹ And it shall become fine dust in kol Eretz Mitzrayim, and shall be a sh’khin (boil) breaking forth with festers upon adam, and upon behemah, throughout kol Eretz Mitzrayim.

¹⁰ And they took piach of the furnace, and stood before Pharaoh; and Moshe sprinkled it up toward Shomayim; and it became a sh’khin breaking forth with festers upon adam, and upon behemah.