Exodus 8:29 in the King James Version
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.
Context
28 Pharaoh said, “I will let you go, that you may sacrifice to the LORD your God in the wilderness, only you shall not go very far away. Pray for me.”
29 Moses said, “Behold, I am going out from you. I will pray to the LORD that the swarms of flies may depart from Pharaoh, from his servants, and from his people, tomorrow; only don’t let Pharaoh deal deceitfully any more in not letting the people go to sacrifice to the LORD.”
30 Moses went out from Pharaoh, and prayed to the LORD.