Exodus 5:2-4 American Standard Version (ASV)
2 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. 3 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. 4 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.