Exodus 5:1-3

1And afterwards Moses and Aaron went in, and said to Pharaoh, Thus saith Jehovah, the 1God of Israel, Let my people go that they may celebrate a feast to me in the wilderness.

2And Pharaoh said, Who is Jehovah, to whose voice I am to hearken to let Israel go? I do not know Jehovah, neither will I let Israel go.

3And they said, The 2God of the Hebrews has met with us: let us go, we pray thee, three days' journey into the wilderness, and sacrifice to Jehovah our 3God; lest he fall upon us with pestilence or with sword.