And the Lord said to Moses, “When you go back to Egypt, see that you perform before Pharaoh all the wonders that I have put in your power, but I will harden his heart, so that he will not let the people go.
The Nile shall swarm with frogs; they shall come up into your palace, into your bedchamber and your bed, into the houses of your officials and of your people, and into your ovens and your kneading bowls.
Moses said to Pharaoh, “Kindly tell me when I am to pray for you and for your officials and for your people, that the frogs may be removed from you and your houses and be left only in the Nile.”