Exodus 8:29 DBY

²⁷  We will go three days' journey into the wilderness, and sacrifice to Jehovah our God, as he shall command us.

²⁸  And Pharaoh said, I will let you go, that you may sacrifice to Jehovah your God in the wilderness; only, go not very far away: intreat for me!

²⁹  And Moses said, Behold, I go out from thee, and will intreat Jehovah; and the dog-flies will depart from Pharaoh, from his bondmen, and from his people, to-morrow; only let not Pharaoh deal deceitfully any more in not letting the people go to sacrifice to Jehovah.

³⁰  And Moses went out from Pharaoh, and intreated Jehovah.

³¹  And Jehovah did according to the word of Moses; and he removed the dog-flies from Pharaoh, from his bondmen, and from his people; there remained not one.