God is YHWH

After the first encounter with Pharoah and the setback from his own people, Moses heard God's instructions again and this God revealed various things to Moses including:
- God introduced his personal name to Moses as YHWH, traditionally this is translated as Jehovah, or simply LORD.
- YHWH is the same God of Abraham, Isaac and Jacob.
- The land promised to the children of Israel is Canaan.
- God intends to rescue Israel from Egypt and make Israel His people and be their God, thus establishing a special relation with Israel that no other nation has.

After the initial instructions, Moses asked God how would Pharoah listen to him when his own people, the Israelites to do not listen to him. Then the Lord spoke to Moses and Aaron again, but we do not know exactly what God said to convince them.

The lineage of the brothers Moses and Aaron were also given here - which is Levi (son of Jacob), fathered Kohath, who fathered Aram, who was the father of Moses and Aaron. Some may suggest that it is the tradition to mention only important people in the lineage thus skipping some generations. However consider that Moses lived to 120 years, it is very plausible that Levi who entered Egypt along with his brothers during the famine at the invitation of Joseph, is actually the great-grandfather of Moses and Aaron who lived about 400 years after they entered Egypt.


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. 3 I appeared to Abraham, to Isaac, and to Jacob, as God Almighty, but by My name LORD[a] I was not known to them. 4 I have also established My covenant with them, to give them the land of Canaan, the land of their pilgrimage, in which they were strangers. 5 And I have also heard the groaning of the children of Israel whom the Egyptians keep in bondage, and I have remembered My covenant. 6 Therefore say to the children of Israel: ‘I am the LORD; I will bring you out from under the burdens of the Egyptians, I will rescue you from their bondage, and I will redeem you with an outstretched arm and with great judgments. 7 I will take you as My people, and I will be your God. Then you shall know that I am the LORD your God who brings you out from under the burdens of the Egyptians. 8 And I will bring you into the land which I swore to give to Abraham, Isaac, and Jacob; and I will give it to you as a heritage: I am the LORD.’” 9 So Moses spoke thus to the children of Israel; but they did not heed Moses, because of anguish of spirit and cruel bondage.
10 And the LORD spoke to Moses, saying, 11 “Go in, tell Pharaoh king of Egypt to let the children of Israel go out of his land.”
12 And Moses spoke before the LORD, saying, “The children of Israel have not heeded me. How then shall Pharaoh heed me, for I am of uncircumcised lips?”
13 Then the LORD spoke to Moses and Aaron, and gave them a command for the children of Israel and for Pharaoh king of Egypt, to bring the children of Israel out of the land of Egypt.

The Family of Moses and Aaron
  
14 These are the heads of their fathers’ houses: The sons of Reuben, the firstborn of Israel, were Hanoch, Pallu, Hezron, and Carmi. These are the families of Reuben. 15 And the sons of Simemon were Jemuel,[b] Jamin, Ohad, Jachin, Zohar, and Shaul the son of a Canaanite woman. These are the families of Simemon. 16 These are the names of the sons of Levi according to their generations: Gershon, Kohath, and Merari. And the years of the life of Levi were one hundred and thirty-seven. 17 The sons of Gershon were Libni and Shimi according to their families. 18 And the sons of Kohath were Amram, Izhar, Hembron, and Uzziel. And the years of the life of Kohath were one hundred and thirty-three. 19 The sons of Merari were Mahli and Mushi. These are the families of Levi according to their generations.
20 Now Amram took for himself Jochebed, his father’s sister, as wife; and she bore him Aaron and Moses. And the years of the life of Amram were one hundred and thirty-seven. 21 The sons of Izhar were Korah, Nempheg, and Zichri. 22 And the sons of Uzziel were Mishael, Elzaphan, and Zithri. 23 Aaron took to himself Elisheba, daughter of Amminadab, sister of Nahshon, as wife; and she bore him Nadab, Abihu, Eleazar, and Ithamar. 24 And the sons of Korah were Assir, Elkanah, and Abiasaph. These are the families of the Korahites. 25 Eleazar, Aaron’s son, took for himself one of the daughters of Putiel as wife; and she bore him Phinehas. These are the heads of the fathers’ houses of the Levites according to their families.
26 These are the same Aaron and Moses to whom the LORD said, “Bring out the children of Israel from the land of Egypt according to their armies.” 27 These are the ones who spoke to Pharaoh king of Egypt, to bring out the children of Israel from Egypt. These are the same Moses and Aaron.

Aaron Is Moses’ Spokesman
  
28 And it came to pass, on the day the LORD spoke to Moses in the land of Egypt, 29 that the LORD spoke to Moses, saying, “I am the LORD. Speak to Pharaoh king of Egypt all that I say to you.”
30 But Moses said before the LORD, “Behold, I am of uncircumcised lips, and how shall Pharaoh heed me?”