Exodus 8:25-29

25Then Pharaoh called Moses and Aaron to come to him. He said to them, ‘Go! You can offer sacrifices to your God here, in Egypt.’

26But Moses said, ‘It would not be right to do that. The Egyptians do not like our sacrifices of animals. If we offer these sacrifices to the Lord our God, the Egyptians will be angry with us. They will throw stones at us to kill us.

27So we must go on a journey for three days into the desert. We will offer sacrifices to the Lord our God there, as he has told us to do.’

28So Pharaoh said, ‘I will let you go. You may go into the desert and offer sacrifices to the Lord your God there. But do not go very far away. And pray for me too.’

29Then Moses said, ‘I will leave you now, and I will pray to the Lord. Tomorrow, all the flies will go away from you, your officers and your people. But be careful! Do not deceive us, as you did before. You must really let the people go away to offer sacrifices to the Lord.’