Exodus 3: 9 - 10 ; 5: 1 - 2
9 The cry of the Israelites has now come to me; I have also seen how the Egyptians oppress them. 10 So come, I will send you to Pharaoh to bring my people, the Israelites, out of Egypt.”
5 Afterward Moses and Aaron went to Pharaoh and said, “Thus says the Lord, the God of Israel, ‘Let my people go, so that they may celebrate a festival to me in the wilderness.’” 2 But Pharaoh said, “Who is the Lord, that I should heed him and let Israel go? I do not know the Lord, and I will not let Israel go.”