Exodus 8:8, 28

Then Pharaoh called for Moses and Aaron, and said, “Entreat the LORD that He may take away the frogs from me and from my people; and I will let the people go, that they may sacrifice to the LORD.”

So Pharaoh said, “I will let you go, that you may sacrifice to the LORD your God in the wilderness; only you shall not go very far away. Intercede for me.”