Exodus 5:15-23
15 Then the Israelite foremen went and appealed to Pharaoh: "Why have you treated your servants this way? 16 Your servants are given no straw, yet we are told, 'Make bricks!' Your servants are being beaten, but the fault is with your own people."

17 Pharaoh said, "Lazy, that's what you are--lazy! That is why you keep saying, 'Let us go and sacrifice to the Lord.' 18 Now get to work. You will not be given any straw, yet you must produce your full quota of bricks."

19 The Israelite foremen realized they were in trouble when they were told, "You are not to reduce the number of bricks required of you for each day." 20 When they left Pharaoh, they found Moses and Aaron waiting to meet them, 21 and they said, "May the Lord look upon you and judge you! You have made us a stench to Pharaoh and his officials and have put a sword in their hand to kill us."

22 Moses returned to the Lord and said, "O Lord, why have you brought trouble upon this people? Is this why you sent me? 23 Ever since I went to Pharaoh to speak in your name, he has brought trouble upon this people, and you have not rescued your people at all."

Exodus 6:1-8
1 Then the Lord said to Moses, "Now you will see what I will do to Pharaoh: Because of my mighty hand he will let them go; because of my mighty hand he will drive them out of his country."

2 God also said to Moses, "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, where they lived as aliens. 5 Moreover, I have heard the groaning of the Israelites, whom the Egyptians are enslaving, and I have remembered my covenant.

6 "Therefore, say to the Israelites: 'I am the Lord, and I will bring you out from under the yoke of the Egyptians. I will free you from being slaves to them, and I will redeem you with an outstretched arm and with mighty acts of judgment. 7 I will take you as my own people, and I will be your God. Then you will know that I am the Lord your God, who brought you out from under the yoke of the Egyptians. 8 And I will bring you to the land I swore with uplifted hand to give to Abraham, to Isaac and to Jacob. I will give it to you as a possession. I am the Lord.'"