29 “As soon as I leave you,” Moses said, “I will appeal to the Lord, and tomorrow the swarms of flies will depart from Pharaoh, his officials, and his people. But Pharaoh must not act deceptively again by refusing to let the people go and sacrifice to the Lord.” 30 Then Moses left Pharaoh’s presence and appealed to the Lord. 31 The Lord did as Moses had said: He removed the swarms of flies from Pharaoh, his officials, and his people; not one was left.