Exodus 5:1-2

1After this presentation to Israel’s leaders, Moses and Aaron went and spoke to Pharaoh. They told him, “This is what the Lord, the God of Israel, says: Let my people go so they may hold a festival in my honor in the wilderness.”

2“Is that so?” retorted Pharaoh. “And who is the Lord? Why should I listen to him and let Israel go? I don’t know the Lord, and I will not let Israel go.”