Exodus 5: 22 So Moses returned to the Lord and said, “Lord, why have You brought trouble on this people? Why is it You have sent me? 23 For since I came to Pharaoh to speak in Your name, he has done evil to this people; neither have You delivered Your people at all.”
Exodus 6: 1 Then the Lord said to Moses, “Now you shall see what I will do to Pharaoh. For with a strong hand he will let them go, and with a strong hand he will drive them out of his land.”
2 And God spoke to Moses and said to him: “I am the Lord.