Exodus 5:1-3

And afterward Moses and Aaron came and said to Pharaoh, “Thus says the LORD, the God of Israel, ‘Let My people go that they may celebrate a feast to Me in the wilderness.’ ” But Pharaoh said, “Who is the LORD that I should obey His voice to let Israel go? I do not know the LORD, and besides, I will not let Israel go.” Then they said, “The God of the Hebrews has met with us. Please, let us go a three days’ journey into the wilderness that we may sacrifice to the LORD our God, otherwise He will fall upon us with pestilence or with the sword.”