Exodus 8:27-29

King James Version

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

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

²⁹ And Moses said, Behold, I go out from thee, and I will intreat the Lord that the swarms of flies may depart from Pharaoh, from his servants, and from his people, to morrow: but let not Pharaoh deal deceitfully any more in not letting the people go to sacrifice to the Lord.