Exodus 8:29-31

New International Version

²⁹ Moses answered, “As soon as I leave you, I will pray to the Lord, and tomorrow the flies will leave Pharaoh and his officials and his people. Only let Pharaoh be sure that he does not act deceitfully^(A) again by not letting the people go to offer sacrifices to the Lord.”

³⁰ Then Moses left Pharaoh and prayed to the Lord,^{(B) 31} and the Lord did what Moses asked. The flies left Pharaoh and his officials and his people; not a fly remained.