Exodus 8:1-4

And the LORD spoke to Moses, “Go to Pharaoh and say to him, ‘Thus says the LORD: “Let My people go, that they may serve Me. But if you refuse to let them go, behold, I will smite all your territory with frogs. So the river shall bring forth frogs abundantly, which shall go up and come into your house, into your bedroom, on your bed, into the houses of your servants, on your people, into your ovens, and into your kneading bowls. And the frogs shall come up on you, on your people, and on all your servants.” ’ ”