Exo 9:10 | JFB | STEP | 10. Moses took ashes from the furnace-- Hebrew, "brick-kiln." The magicians, being sufferers in their own persons, could do nothing, though they had been called; and as the brick-kiln was one of the principal instruments of oppression to the Israelites [De 4:20; ; Jr 11:4], it was now converted into a means of chastisement to the Egyptians, who were made to read their sin in their punishment.

‏ Exodus 9:10

10. Moses took ashes from the furnace--Hebrew, "brick-kiln." The magicians, being sufferers in their own persons, could do nothing, though they had been called; and as the brick-kiln was one of the principal instruments of oppression to the Israelites [De 4:20; 1Ki 8:51; Jr 11:4], it was now converted into a means of chastisement to the Egyptians, who were made to read their sin in their punishment.