Exodus 8:25-32

The king called for Moses and Aaron and told them, “Offer sacrifices to your God here in this country.” But Moses said, “It wouldn’t be right to do that, because the Egyptians hate the sacrifices we offer to the LORD our God. If they see us offering sacrifices they hate, they will throw stones at us and kill us. Let us make a three-day journey into the desert. We must offer sacrifices to the LORD our God there, as the LORD told us to do.” The king said, “I will let you go so that you may offer sacrifices to the LORD your God in the desert, but you must not go very far away. Now go and pray for me.” Moses said, “I will leave and pray to the LORD, and he will take the flies away from you, your officers, and your people tomorrow. But do not try to trick us again. Do not stop the people from going to offer sacrifices to the LORD.” So Moses left the king and prayed to the LORD, and the LORD did as he asked. He removed the flies from the king, his officers, and his people so that not one fly was left. But the king became stubborn again and did not let the people go.