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Romans 9:9
For this is the word of God's undertaking, At this time will I come, and Sarah will have a son.

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Romans 9:8
That is, it is not the children of the flesh, but the children of God's undertaking, who are named as the seed.

Galatians 4:28
Now we, brothers, as Isaac was, are the children of the undertaking of God.

Genesis 17:7
And I will make between me and you and your seed after you through all generations, an eternal agreement to be a God to you and to your seed after you.

Galatians 3:29
And if you are Christ's, then you are Abraham's seed, and yours is the heritage by the right of God's undertaking given to Abraham.

Galatians 4:22
Because it is in the Writings, that Abraham had two sons, one by the servant-woman, and one by the free woman.

Galatians 4:23
Now the son by the servant-woman has his birth after the flesh; but the son by the free woman has his birth through the undertaking of God.

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Genesis 18:10
And he said, I will certainly come back to you in the spring, and Sarah your wife will have a son. And his words came to the ears of Sarah who was at the back of the tent-door.

Genesis 18:14
Is there any wonder which the Lord is not able to do? At the time I said, in the spring, I will come back to you, and Sarah will have a child.

Genesis 17:21
But my agreement will be with Isaac, to whom Sarah will give birth a year from this time.

Genesis 21:2
And Sarah became with child, and gave Abraham a son when he was old, at the time named by God.

Genesis 17:16
And I will give her a blessing so that you will have a son by her: truly my blessing will be on her, and she will be the mother of nations: kings of peoples will be her offspring.

Matthew 1:2
The son of Abraham was Isaac; and the son of Isaac was Jacob; and the sons of Jacob were Judah and his brothers;

Hebrews 11:11
And by faith Sarah herself had power to give birth, when she was very old, because she had faith in him who gave his word;

Hebrews 11:17
By faith Abraham made an offering of Isaac, when he was tested: and he with whom the agreement had been made gave up as an offering the only son of his body,

1 Peter 3:6
As Sarah was ruled by Abraham, naming him lord; whose children you are if you do well, and are not put in fear by any danger.

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Genesis 21:10
So she said to Abraham, Send away that woman and her son: for the son of that woman is not to have a part in the heritage with my son Isaac.

Genesis 21:11
And this was a great grief to Abraham because of his son.

Genesis 21:12
But God said, Let it not be a grief to you because of the boy and Hagar his mother; give ear to whatever Sarah says to you, because it is from Isaac that your seed will take its name.

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