Exodus 5:1-4

And afterward Moses and Aaron came, and said unto Pharaoh, Thus saith Jehovah, the God of Israel, Let my people go, that they may hold a feast unto me in the wilderness. And Pharaoh said, Who is Jehovah, that I should hearken unto his voice to let Israel go? I know not Jehovah, and moreover I will not let Israel go. And they said, The God of the Hebrews hath met with us: let us go, we pray thee, three days’ journey into the wilderness, and sacrifice unto Jehovah our God, lest he fall upon us with pestilence, or with the sword. And the king of Egypt said unto them, Wherefore do ye, Moses and Aaron, loose the people from their works? get you unto your burdens.