18 The magicians tried with their enchantments to bring forth lice, but they couldn't. There were lice on man, and on animal.
19 Then the magicians said to Pharaoh, "This is the finger of God:" and Pharaoh's heart was hardened, and he didn't listen to them; as Yahweh had spoken.
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Commentary on Exodus 8 Matthew Henry Commentary
Chapter 8
Three more of the plagues of Egypt are related in this chapter,
Exd 8:1-15
Pharaoh is here first threatened and then plagued with frogs, as afterwards, in this chapter, with lice and flies, little despicable inconsiderable animals, and yet by their vast numbers rendered sore plagues to the Egyptians. God could have plagued them with lions, or bears, or wolves, or with vultures or other birds of prey; but he chose to do it by these contemptible instruments.
Exd 8:16-19
Here is a short account of the plague of lice. It does not appear that any warning was given of it before. Pharaoh's abuse of the respite granted to him might have been a sufficient warning to him to expect another plague: for if the removal of an affliction harden us, and so we lose the benefit of it, we may conclude it goes away with a purpose to return or to make room for a worse. Observe,
Exd 8:20-32
Here is the story of the plague of flies, in which we are told,
Lastly, The issue of all was that God graciously removed the plague (v. 30, 31), but Pharaoh perfidiously returned to his hardness, and would not let the people go, v. 32. His pride would not let him part with such a flower of his crown as his dominion over Israel was, nor his covetousness with such a branch of his revenue as their labours were. Note, Reigning lusts break through the strongest bounds, and make men impudently presumptuous and scandalously perfidious. Let not sin therefore reign; for, if it do, it will betray and hurry us to the grossest absurdities.