How God Makes Himself Known

1 Afterward Moses and Aaron went and said to Pharaoh, “Thus says the Lord, the God of Israel, ‘Let my people go, that they may hold a feast to me in the wilderness.’” 2 But Pharaoh said, “Who is the Lord, that I should obey his voice and let Israel go? I do not know the Lord, and moreover, I will not let Israel go.” 3 Then they said, “The God of the Hebrews has met with us. Please let us go a three days' journey into the wilderness that we may sacrifice to the Lord our God, lest he fall upon us with pestilence or with the sword.” 4 But the king of Egypt said to them, “Moses and Aaron, why do you take the people away from their work? Get back to your burdens.” 5 And Pharaoh said, “Behold, the people of the land are now many, and you make them rest from their burdens!” 6 The same day Pharaoh commanded the taskmasters of the people and their foremen, 7 “You shall no longer give the people straw to make bricks, as in the past; let them go and gather straw for themselves. 8 But the number of bricks that they made in the past you shall impose on them, you shall by no means reduce it, for they are idle. Therefore they cry, ‘Let us go and offer sacrifice to our God.’ 9 Let heavier work be laid on the men that they may labor at it and pay no regard to lying words.”
Exodus 5:1-9

20 They met Moses and Aaron, who were waiting for them, as they came out from Pharaoh; 21 and they said to them, “The Lord look on you and judge, because you have made us stink in the sight of Pharaoh and his servants, and have put a sword in their hand to kill us.” 22 Then Moses turned to the Lord and said, “O Lord, why have you done evil to this people? Why did you ever send me? 23 For since I came to Pharaoh to speak in your name, he has done evil to this people, and you have not delivered your people at all.” Exodus 5:20-23

6:1 But the Lord said to Moses, “Now you shall see what I will do to Pharaoh; for with a strong hand he will send them out, and with a strong hand he will drive them out of his land.” 2 God spoke to Moses and said to him, “I am the Lord. 3 I appeared to Abraham, to Isaac, and to Jacob, as God Almighty, but by my name the Lord I did not make myself known to them. 4 I also established my covenant with them to give them the land of Canaan, the land in which they lived as sojourners. 5 Moreover, I have heard the groaning of the people of Israel whom the Egyptians hold as slaves, and I have remembered my covenant. 6 Say therefore to the people of Israel, ‘I am the Lord, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from slavery to them, and I will redeem you with an outstretched arm and with great acts of judgment. 7 I will take you to be my people, and I will be your God, and you shall know that I am the Lord your God, who has brought you out from under the burdens of the Egyptians. 
8 I will bring you into the land that I swore to give to Abraham, to Isaac, and to Jacob. I will give it to you for a possession. I am the Lord.’” Exodus 6:1-8

7 I will take you to be my people, and I will be your God, and you shall know that I am the Lord your God, who has brought you out from under the burdens of the Egyptians. Exodus 6:7

9 Moses spoke thus to the people of Israel, but they did not listen to Moses, because of their broken spirit and harsh slavery. 10 So the Lord said to Moses, 11 “Go in, tell Pharaoh king of Egypt to let the people of Israel go out of his land.” 12 But Moses said to the Lord, “Behold, the people of Israel have not listened to me. How then shall Pharaoh listen to me, for I am of uncircumcised lips?” 13 But the Lord spoke to Moses and Aaron and gave them a charge about the people of Israel and about Pharaoh king of Egypt: to bring the people of Israel out of the land of Egypt.
Exodus 6:9-13

7:1 And the Lord said to Moses, “See, I have made you like God to Pharaoh, and your brother Aaron shall be your prophet.2 You shall speak all that I command you, and your brother Aaron shall tell Pharaoh to let the people of Israel go out of his land. 3 But I will harden Pharaoh's heart, and though I multiply my signs and wonders in the land of Egypt, 4 Pharaoh will not listen to you. Then I will lay my hand on Egypt and bring my hosts, my people the children of Israel, out of the land of Egypt by great acts of judgment. 5 The Egyptians shall know that I am the Lord, when I stretch out my hand against Egypt and bring out the people of Israel from among them.” Exodus 7:1-5