Genesis 16 Abram has a son through a concubine

 Now Sarai, Abram's wife, bare him no children: and she had a handmaid, an Egyptian, whose name was Hagar.

2 And Sarai said unto Abram, Behold now, Jehovah hath restrained me from bearing; go in, I pray thee, unto my handmaid; it may be that I shall obtain children by her. And Abram hearkened to the voice of Sarai.

3 And Sarai, Abram's wife, took Hagar the Egyptian, her handmaid, after Abram had dwelt ten years in the land of Canaan, and gave her to Abram her husband to be his wife.

4 And he went in unto Hagar, and she conceived: and when she saw that she had conceived, her mistress was despised in her eyes.

5 And Sarai said unto Abram, My wrong be upon thee: I gave my handmaid into they bosom; and when she saw that she had conceived, I was despised in her eyes: Jehovah judge between me and thee.

6 But Abram said unto Sarai, Behold, thy maid is in thy hand; do to her that which is good in thine eyes. And Sarai dealt hardly with her, and she fled from her face.

7 And the angel of Jehovah found her by a fountain of water in the wilderness, by the fountain in the way to Shur.

8 And he said, Hagar, Sarai's handmaid, whence camest thou? and whither goest thou? And she said, I am fleeing from the face of my mistress Sarai.

9 And the angel of Jehovah said unto her, Return to thy mistress, and submit thyself under her hands.

10 And the angel of Jehovah said unto her, I will greatly multiply thy seed, that it shall not be numbered for multitude.

11 And the angel of Jehovah said unto her, Behold, thou art with child, and shalt bear a son; and thou shalt call his name Ishmael, because Jehovah hath heard thy affliction.

12 And he shall be as a wild ass among men; his hand shall be against every man, and every man's hand against him; and he shall dwell over against all his brethren.

13 And she called the name of Jehovah that spake unto her, Thou art a God that seeth: for she said, Have I even here looked after him that seeth me?

14 Wherefore the well was called Beer-lahai-roi; behold, it is between Kadesh and Bered.

15 And Hagar bare Abram a son: and Abram called the name of his son, whom Hagar bare, Ishmael.

16 And Abram was fourscore and six years old, when Hagar bare Ishmael to Abram.

Indeed, Abram had a son, but this was not the son of promise. Because of his relationship to Abram he was blessed by God. But God has future plans in store for Abram.

Genesis 15 The Abrahamic Covenant

The Abrahamic Covenant

15 After these events, the word of the Lord came to Abram in a vision:

Do not be afraid, Abram.
I am your shield;
your reward will be very great.

2 But Abram said, “Lord God, what can You give me, since I am childless and the heir of my house is Eliezer of Damascus?” 3 Abram continued, “Look, You have given me no offspring, so a slave born in my house will be my heir.”

4 Now the word of the Lord came to him: “This one will not be your heir; instead, one who comes from your own body will be your heir.” 5 He took him outside and said, “Look at the sky and count the stars, if you are able to count them.” Then He said to him, “Your offspring will be that numerous.”

6 Abram believed the Lord, and He credited it to him as righteousness.

7 He also said to him, “I am Yahweh who brought you from Ur of the Chaldeans to give you this land to possess.”

8 But he said, “Lord God, how can I know that I will possess it?”

9 He said to him, “Bring Me a three-year-old cow, a three-year-old female goat, a three-year-old ram, a turtledove, and a young pigeon.”

10 So he brought all these to Him, split them down the middle, and laid the pieces opposite each other, but he did not cut up the birds. 11 Birds of prey came down on the carcasses, but Abram drove them away. 12 As the sun was setting, a deep sleep fell on Abram, and suddenly great terror and darkness descended on him.

13 Then the Lord said to Abram, “Know this for certain: Your offspring will be foreigners in a land that does not belong to them; they will be enslaved and oppressed 400 years. 14 However, I will judge the nation they serve, and afterward they will go out with many possessions. 15 But you will go to your fathers in peace and be buried at a ripe old age. 16 In the fourth generation they will return here, for the iniquity of the Amorites has not yet reached its full measure.”

17 When the sun had set and it was dark, a smoking fire pot and a flaming torch appeared and passed between the divided animals. 18 On that day the Lord made a covenant with Abram, saying, “I give this land to your offspring,from the brook of Egypt to the Euphrates River: 19 the land of the Kenites, Kenizzites, Kadmonites, 20 Hittites, Perizzites, Rephaim, 21 Amorites, Canaanites, Girgashites, and Jebusites.”

The great nation promised Abram were the future descendants of the twelve sons of Jacob.  Jacob's name was changed to Israel and they were to mediate God's blessings to the nations. This is called the Abramhamic Covenant and is central to the Christian faith because Jesus Christ will proceed from it. 

Genesis 14 Abram Rescues Lot & Is Blessed

In those days Amraphel king of Shinar, Arioch king of Ellasar, Chedorlaomer king of Elam, and Tidal king of Goiim 2 waged war against Bera king of Sodom, Birsha king of Gomorrah, Shinab king of Admah, and Shemeber king of Zeboiim, as well as the king of Bela (that is, Zoar). 3 All of these came as allies to the Valley of Siddim (that is, the Dead Sea). 4 They were subject to Chedorlaomer for 12 years, but in the thirteenth year they rebelled. 5 In the fourteenth year Chedorlaomer and the kings who were with him came and defeated the Rephaim in Ashteroth-karnaim, the Zuzim in Ham, the Emim in Shaveh-kiriathaim, 6 and the Horites in the mountains of Seir, as far as El-paran by the wilderness. 7 Then they came back to invade En-mishpat (that is, Kadesh), and they defeated all the territory of the Amalekites, as well as the Amorites who lived in Hazazon-tamar.

8 Then the king of Sodom, the king of Gomorrah, the king of Admah, the king of Zeboiim, and the king of Bela (that is, Zoar) went out and lined up for battle in the Valley of Siddim 9 against Chedorlaomer king of Elam, Tidal king of Goiim, Amraphel king of Shinar, and Arioch king of Ellasar—four kings against five. 10 Now the Valley of Siddim contained many asphalt pits, and as the kings of Sodom and Gomorrah fled, some fell into them, but the rest fled to the mountains. 11 The four kings took all the goods of Sodom and Gomorrah and all their food and went on. 12 They also took Abram’s nephew Lot and his possessions, for he was living in Sodom, and they went on.

13 One of the survivors came and told Abram the Hebrew, who lived near the oaks belonging to Mamre the Amorite, the brother of Eshcol and the brother of Aner. They were bound by a treaty with Abram. 14 When Abram heard that his relative had been taken prisoner, he assembled his 318 trained men, born in his household, and they went in pursuit as far as Dan. 15 And he and his servants deployed against them by night, attacked them, and pursued them as far as Hobah to the north of Damascus. 16 He brought back all the goods and also his relative Lot and his goods, as well as the women and the other people.

Melchizedek’s Blessing

17 After Abram returned from defeating Chedorlaomer and the kings who were with him, the king of Sodom went out to meet him in the Valley of Shaveh (that is, the King’s Valley). 18 Then Melchizedek, king of Salem,brought out bread and wine; he was a priest to God Most High. 19 He blessed him and said:

Abram is blessed by God Most High,
Creator of heaven and earth,
20 and I give praise to God Most High
who has handed over your enemies to you.

And Abram gave him a tenth of everything.

21 Then the king of Sodom said to Abram, “Give me the people, but take the possessions for yourself.”

22 But Abram said to the king of Sodom, “I have raised my hand in an oath to Yahweh, God Most High, Creator of heaven and earth, 23 that I will not take a thread or sandal strap or anything that belongs to you, so you can never say, ‘I made Abram rich.’ 24 I will take nothing except what the servants have eaten. But as for the share of the men who came with me—Aner, Eshcol, and Mamre—they can take their share.”

Lot who is Abram's close relative was held prisoner while living in the spiritually depressed land of Sodom. Abram and his select warriors rescued Lot from his enemies by the hand of God. Abram began the tradition of tithing by giving a tenth of his spoils to his advocate who was the High Priest of God.

I

Genesis 13 Abram and Lot Separate

So Abram went up from Egypt to the Negev, with his wife and everything he had, and Lot went with him. 2 Abram had become very wealthy in livestock and in silver and gold.

3 From the Negev he went from place to place until he came to Bethel, to the place between Bethel and Ai where his tent had been earlier 4 and where he had first built an altar. There Abram called on the name of the Lord.

5 Now Lot, who was moving about with Abram, also had flocks and herds and tents. 6 But the land could not support them while they stayed together, for their possessions were so great that they were not able to stay together.7 And quarreling arose between Abram’s herders and Lot’s. The Canaanites and Perizzites were also living in the land at that time.

8 So Abram said to Lot, “Let’s not have any quarreling between you and me,or between your herders and mine, for we are close relatives. 9 Is not the whole land before you? Let’s part company. If you go to the left, I’ll go to the right; if you go to the right, I’ll go to the left.”

10 Lot looked around and saw that the whole plain of the Jordan toward Zoarwas well watered, like the garden of the Lord, like the land of Egypt. (This was before the Lord destroyed Sodom and Gomorrah.) 11 So Lot chose for himself the whole plain of the Jordan and set out toward the east. The two men parted company: 12 Abram lived in the land of Canaan, while Lot lived among the cities of the plain and pitched his tents near Sodom. 13 Now the people of Sodom were wicked and were sinning greatly against the Lord.

14 The Lord said to Abram after Lot had parted from him, “Look around from where you are, to the north and south, to the east and west. 15 All the land that you see I will give to you and your offspring forever. 16 I will make your offspring like the dust of the earth, so that if anyone could count the dust, then your offspring could be counted. 17 Go, walk through the length and breadth of the land, for I am giving it to you.”

18 So Abram went to live near the great trees of Mamre at Hebron, where he pitched his tents. There he built an altar to the Lord.

So Lot who was Abram's close relative traveled with him and the Lord blessed each of their households..   The cattle and possessions became to the the point where they could not share the land so Abram told Lot to choose the direction he would go and  Abram would go the other way. Lot selected the land towards Sodom as it looked fertile and Abram went into the Negev Desert toward Jerusalem and  it  there they parted.

The Call of Abram

12 The Lord had said to Abram, “Go from your country, your people and your father’s household to the land I will show you.

2 “I will make you into a great nation,
    and I will bless you;
I will make your name great,
    and you will be a blessing.
3 I will bless those who bless you,
    and whoever curses you I will curse;
and all peoples on earth
    will be blessed through you.”

4 So Abram went, as the Lord had told him; and Lot went with him. Abram was seventy-five years old when he set out from Harran. 5 He took his wife Sarai, his nephew Lot, all the possessions they had accumulated and the people they had acquired in Harran, and they set out for the land of Canaan,and they arrived there.

6 Abram traveled through the land as far as the site of the great tree of Moreh at Shechem. At that time the Canaanites were in the land. 7 The Lordappeared to Abram and said, “To your offspring I will give this land.” So he built an altar there to the Lord, who had appeared to him.

8 From there he went on toward the hills east of Bethel and pitched his tent,with Bethel on the west and Ai on the east. There he built an altar to the Lordand called on the name of the Lord.

9 Then Abram set out and continued toward the Negev.

Abram in Egypt

10 Now there was a famine in the land, and Abram went down to Egypt to live there for a while because the famine was severe. 11 As he was about to enter Egypt, he said to his wife Sarai, “I know what a beautiful woman you are.12 When the Egyptians see you, they will say, ‘This is his wife.’ Then they will kill me but will let you live. 13 Say you are my sister, so that I will be treated well for your sake and my life will be spared because of you.”

14 When Abram came to Egypt, the Egyptians saw that Sarai was a very beautiful woman. 15 And when Pharaoh’s officials saw her, they praised her to Pharaoh, and she was taken into his palace. 16 He treated Abram well for her sake, and Abram acquired sheep and cattle, male and female donkeys, male and female servants, and camels.

17 But the Lord inflicted serious diseases on Pharaoh and his householdbecause of Abram’s wife Sarai. 18 So Pharaoh summoned Abram. “What have you done to me?” he said. “Why didn’t you tell me she was your wife? 19 Why did you say, ‘She is my sister,’ so that I took her to be my wife? Now then, here is your wife. Take her and go!” 20 Then Pharaoh gave orders about Abram to his men, and they sent him on his way, with his wife and everything he had

In this chapter the Bible shifts from the call of a single Savior to a national plan  (dispensationalism)  Abraham was considered righteous because he believed God and from his seed a nation of priests would emerge.  God was seeking Israel to be a blessing to the nations.