2 If you refuse to let them go, behold, I will plague all your borders with frogs: 3 and the river shall swarm with frogs, which shall go up and come into your house, and into your bedchamber, and on your bed, and into the house of your servants, and on your people, and into your ovens, and into your kneading troughs: 4 and the frogs shall come up both on you, and on your people, and on all your servants.’” 5 Yahweh said to Moses, “Tell Aaron, ‘Stretch forth your hand with your rod over the rivers, over the streams, and over the pools, and cause frogs to come up on the land of Egypt.’” 6 Aaron stretched out his hand over the waters of Egypt; and the frogs came up, and covered the land of Egypt. 7 The magicians did in like manner with their enchantments, and brought up frogs on 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.