Exodus 8:27-32 NIV

27 We must take a three-day journey into the wilderness to offer sacrifices to the LORD our God, as he commands us.”

References for Exodus 8:27

28 Pharaoh said, “I will let you go to offer sacrifices to the LORD your God in the wilderness, but you must not go very far. Now pray for me.”

References for Exodus 8:28

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 again by not letting the people go to offer sacrifices to the LORD.”

References for Exodus 8:29

30 Then Moses left Pharaoh and prayed to the LORD,

References for Exodus 8:30

31 and the LORD did what Moses asked. The flies left Pharaoh and his officials and his people; not a fly remained.
32 But this time also Pharaoh hardened his heart and would not let the people go.

References for Exodus 8:32