Genesis 21:1-7
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 17:15-19
Then God said to Abraham, “As for Sarai your wife, do not call her Sarai, for her name is to be Sarah. / And I will bless her and will surely give you a son by her. I will bless her, and she will be the mother of nations; kings of peoples will descend from her.” / Abraham fell facedown. Then he laughed and said to himself, “Can a child be born to a man who is a hundred years old? Can Sarah give birth at the age of ninety?” ...

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 25:5-6
Abraham left everything he owned to Isaac. / But while he was still alive, Abraham gave gifts to the sons of his concubines and sent them away from his son Isaac to the land of the east.

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.”

Genesis 15:4-6
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.” / Abram believed the LORD, and it was credited to him as righteousness.

Genesis 22:15-18
And the angel of the LORD called to Abraham from heaven a second time, / saying, “By Myself I have sworn, declares the LORD, that because you have done this and have not withheld your only son, / I will surely bless you, and I will multiply your descendants like the stars in the sky and the sand on the seashore. Your descendants will possess the gates of their enemies. ...

Genesis 26:3-5
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, / because Abraham listened to My voice and kept My charge, My commandments, My statutes, and My laws.”

Genesis 28:13-14
And there at the top the LORD was standing and saying, “I am the LORD, the God of your father Abraham and the God of Isaac. I will give you and your descendants the land on which you now lie. / Your descendants will be like the dust of the earth, and you will spread out to the west and east and north and south. All the families of the earth will be blessed through you and your offspring.

Genesis 30:22-24
Then God remembered Rachel. He listened to her and opened her womb, / and she conceived and gave birth to a son. “God has taken away my shame,” she said. / She named him Joseph, and said, “May the LORD add to me another son.”

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.”

Hebrews 11:11-12
By faith Sarah, even though she was barren and beyond the proper age, was enabled to conceive a child, because she considered Him faithful who had promised. / And so from one man, and he as good as dead, came descendants as numerous as the stars in the sky and as countless as the sand on the seashore.

Galatians 4:22-23
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.

Acts 7:8
Then God gave Abraham the covenant of circumcision, and Abraham became the father of Isaac and circumcised him on the eighth day. And Isaac became the father of Jacob, and Jacob of the twelve patriarchs.

Romans 4:19-21
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, / being fully persuaded that God was able to do what He had promised.