Shemot 9:6-8

Orthodox Jewish Bible

⁶ And Hashem did that thing on the next day, and all the mikneh of Mitzrayim died; but of the mikneh of the Bnei Yisroel died not one.

⁷ And Pharaoh sent, and, hinei, there was not one of the mikneh Yisroel dead. And the lev Pharaoh was hardened, and he did not let HaAm go.

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.