Then the LORD said to Moses, "Go to Pharaoh and tell him: This is what the LORD says: Let my people go so that they can worship me.
References for Exodus 8:1
If you refuse to let them go, then I'll send a plague of frogs over your whole country.
The Nile will overflow with frogs. They'll get into your palace, into your bedroom and onto your bed, into your officials' houses, and among all your people, and even into your ovens and bread pans.
The frogs will crawl up on you, your people, and all your officials."
And the LORD said to Moses, "Tell Aaron, ‘Stretch out your hand with your shepherd's rod over the rivers, the canals, and the marshes, and make the frogs crawl up all over the land of Egypt.'"
References for Exodus 8:5
So Aaron stretched out his hand over the waters of Egypt. The frogs crawled up and covered the land of Egypt.