2 And if you will not let them go, see, I will send frogs into every part of your land: 3 The Nile will be full of frogs, and they will come up into your house and into your bedrooms and on your bed, and into the houses of your servants and your people, and into your ovens and into your bread-basins. 4 The frogs will come up over you and your people and all your servants. 5 And the Lord said to Moses, Say to Aaron, Let the rod in your hand be stretched out over the streams and the waterways and the pools, causing frogs to come up on the land of Egypt. 6 And when Aaron put out his hand over the waters of Egypt, the frogs came up and all the land of Egypt was covered with them. 7 And the wonder-workers did the same with their secret arts, making frogs come up over the land of Egypt.
Matthew Henry's Commentary on Exodus 8:2-7
Commentary on Exodus 8:1-15
(Read Exodus 8:1-15)
Pharaoh is plagued with frogs; their vast numbers made them sore plagues to the Egyptians. God could have plagued Egypt with lions, or bears, or wolves, or with birds of prey, but he chose to do it by these despicable creatures. God, when he pleases, can arm the smallest parts of the creation against us. He thereby humbled Pharaoh. They should neither eat, nor drink, nor sleep in quiet; but wherever they were, they should be troubled by the frogs. God's curse upon a man will pursue him wherever he goes, and lie heavy upon him whatever he does. Pharaoh gave way under this plague. He promises that he will let the people go. Those who bid defiance to God and prayer, first or last, will be made to see their need of both. But when Pharaoh saw there was respite, he hardened his heart. Till the heart is renewed by the grace of God, the thoughts made by affliction do not abide; the convictions wear off, and the promises that were given are forgotten. Till the state of the air is changed, what thaws in the sun will freeze again in the shade.