Exodus 5:1-3

And afterward Moses and Aaron came and said to Pharaoh, “This is what the Lord, the God of Israel says: ‘Let My people go so 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 so that we may sacrifice to the Lord our God, otherwise He will strike us with plague or with the sword.”