‘Let my people go,’ says the Lord God of Israel.

Afterward Moses and Aaron went in and told Pharaoh, “Thus says the Lord God of Israel: ‘Let My people go, that they may hold a feast to Me in the wilderness.’ ” And Pharaoh said, “Who is the Lord, that I should obey His voice to let Israel go? I do not know the Lord , nor will I let Israel go.” So they said, “The God of the Hebrews has met with us. Please, let us go three days’ journey into the desert and sacrifice to the Lord our God, lest He fall upon us with pestilence or with the sword.” Then the king of Egypt said to them, “Moses and Aaron, why do you take the people from their work? Get back to your labor.” And Pharaoh said, “Look, the people of the land are  many now, and you make them rest from their labor!” So the same day Pharaoh commanded the taskmasters of the people and their officers, saying, “You shall no longer give the people straw to make brick as before. Let them go and gather straw for themselves. And you shall lay on them the quota of bricks which they made before. You shall not reduce it. For they are idle; therefore they cry out, saying, ‘Let us go and sacrifice to our God.’ Let more work be laid on the men, that they may labor in it, and let them not regard false words.” So Moses returned to the Lord and said, “Lord, why have You brought trouble on this people? Why is it You have sent me? For since I came to Pharaoh to speak in Your name, he has done evil to this people; neither have You delivered Your people at all.”
Exodus 5:1-9,22-23 - NKJV