ויחזק לב פרעה ולא שמע אליהם כאשר דבר ד'
The Torah informs us that Hashem hardened Pharaoh’s heart and then continues to relate concerning the next plague, arov, mixture of animals. What happened to the kinnim, lice? Did they leave? Nothing is mentioned of their disappearance. Horav Sholom Schwadron, zl, suggests that quite possibly the lice became permanent residents of Egypt. Why? Because Pharaoh did not beg for them to be removed – as he did earlier with the frogs. Indeed, as support for this, Rav Sholom cites the pasuk in Tehillim 105:31: Amar va’yavo arov, kinnim b’chol gevulam, “He spoke and hordes of beasts arrived, and lice throughout…