Genesis 21:10-12
and she said to Abraham, “Expel the slave woman and her son, for the slave woman’s son will never share in the inheritance with my son Isaac!” / Now this matter distressed Abraham greatly because it concerned his son Ishmael. / But God said to Abraham, “Do not be distressed about the boy and your maidservant. Listen to everything that Sarah tells you, for through Isaac your offspring will be reckoned.

Genesis 16:15-16
And Hagar bore Abram a son, and Abram gave the name Ishmael to the son she had borne. / Abram was eighty-six years old when Hagar bore Ishmael to him.

Genesis 21:1-3
Now the LORD attended to Sarah as He had said, and the LORD did for Sarah what He had promised. / So Sarah conceived and bore a son to Abraham in his old age, at the very time God had promised. / And Abraham gave the name Isaac to the son Sarah bore to him.

Genesis 25:12-18
This is the account of Abraham’s son Ishmael, whom Hagar the Egyptian, Sarah’s maidservant, bore to Abraham. / These are the names of the sons of Ishmael in the order of their birth: Nebaioth the firstborn of Ishmael, then Kedar, Adbeel, Mibsam, / Mishma, Dumah, Massa, ...

Romans 9:7-9
Nor because they are Abraham’s descendants are they all his children. On the contrary, “Through Isaac your offspring will be reckoned.” / So it is not the children of the flesh who are God’s children, but it is the children of the promise who are regarded as offspring. / For this is what the promise stated: “At the appointed time I will return, and Sarah will have a son.”

Galatians 4:22-31
For it is written that Abraham had two sons, one by the slave woman and the other by the free woman. / His son by the slave woman was born according to the flesh, but his son by the free woman was born through the promise. / These things serve as illustrations, for the women represent two covenants. One covenant is from Mount Sinai and bears children into slavery: This is Hagar. ...

Genesis 18:10-14
Then the LORD said, “I will surely return to you at this time next year, and your wife Sarah will have a son!” Now Sarah was behind him, listening at the entrance to the tent. / And Abraham and Sarah were already old and well along in years; Sarah had passed the age of childbearing. / So she laughed to herself, saying, “After I am worn out and my master is old, will I now have this pleasure?” ...

Genesis 22:2
“Take your son,” God said, “your only son Isaac, whom you love, and go to the land of Moriah. Offer him there as a burnt offering on one of the mountains, which I will show you.”

Hebrews 11:17-18
By faith Abraham, when he was tested, offered up Isaac on the altar. He who had received the promises was ready to offer his one and only son, / even though God had said to him, “Through Isaac your offspring will be reckoned.”

Genesis 15:4-5
Then the word of the LORD came to Abram, saying, “This one will not be your heir, but one who comes from your own body will be your heir.” / And the LORD took him outside and said, “Now look to the heavens and count the stars, if you are able.” Then He told him, “So shall your offspring be.”

Genesis 21:13
But I will also make a nation of the slave woman’s son, because he is your offspring.”

Genesis 18:17-19
And the LORD said, “Shall I hide from Abraham what I am about to do? / Abraham will surely become a great and powerful nation, and through him all the nations of the earth will be blessed. / For I have chosen him, so that he will command his children and his household after him to keep the way of the LORD by doing what is right and just, in order that the LORD may bring upon Abraham what He has promised.”

Genesis 26:2-5
The LORD appeared to Isaac and said, “Do not go down to Egypt. Settle in the land where I tell you. / Stay in this land as a foreigner, and I will be with you and bless you. For I will give all these lands to you and your offspring, and I will confirm the oath that I swore to your father Abraham. / I will make your descendants as numerous as the stars in the sky, and I will give them all these lands, and through your offspring all nations of the earth will be blessed, ...

Romans 4:18-21
Against all hope, Abraham in hope believed and so became the father of many nations, just as he had been told, “So shall your offspring be.” / Without weakening in his faith, he acknowledged the decrepitness of his body (since he was about a hundred years old) and the lifelessness of Sarah’s womb. / Yet he did not waver through disbelief in the promise of God, but was strengthened in his faith and gave glory to God, ...

Genesis 12:2-3
I will make you into a great nation, and I will bless you; I will make your name great, so that you will be a blessing. / I will bless those who bless you and curse those who curse you; and all the families of the earth will be blessed through you.”