Exodus 8:32 WBT

³⁰  And Moses went out from Pharaoh, and entreated the LORD:

³¹  And the LORD did according to the word of Moses; and he removed the swarms [of flies] from Pharaoh, from his servants, and from his people; there remained not one.

³²  And Pharaoh hardened his heart at this time also, neither would he let the people go.