Romans 9:7

It is not because they are Abraham's that they are all children, but: What will be called 'your seed' will be through Isaac. (Genesis 21:12)

Genesis 21:12

God said to Abraham: Do not be upset about the boy and your slave. Listen to what Sarah says, because through Isaac your descendants will carry on your name.

Hebrews 11:18

It was said: In Isaac your descendants will be called.

Luke 3:8

Produce fruit that is worthy of repentance. Do not say we have Abraham for our father. I tell you, that God is able to make these stones into children for Abraham.

Luke 16:24-25

He called out: Father Abraham! Take pity on me! Please send Lazarus to dip his finger in some water and cool off my tongue. I am in torment in this fire!

Luke 16:30

The rich man responded: It is not enough father Abraham! If someone from the dead went to them they would repent.

John 8:33

They answered him: We are Abraham's seed, and have never been in bondage to any man. How can you say we will be made free?

John 8:37-39

I know that you are Abraham's seed. Yet you seek to kill me. That is because my word has no place among you.

Galatians 4:23

How is it that the son by the slave woman is born after the flesh; but the son by the freewoman is born through promise?

Philippians 3:3

We are those with true circumcision who worship by the Spirit of God. We glory in Christ Jesus, and put no confidence in the flesh.

Treasury of Scripture Knowledge

Summary

Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.

General references

Bible References

Because

Luke 3:8
Produce fruit that is worthy of repentance. Do not say we have Abraham for our father. I tell you, that God is able to make these stones into children for Abraham.
Luke 16:24
He called out: Father Abraham! Take pity on me! Please send Lazarus to dip his finger in some water and cool off my tongue. I am in torment in this fire!
John 8:37
I know that you are Abraham's seed. Yet you seek to kill me. That is because my word has no place among you.
Philippians 3:3
We are those with true circumcision who worship by the Spirit of God. We glory in Christ Jesus, and put no confidence in the flesh.

In isaac

Genesis 21:12
God said to Abraham: Do not be upset about the boy and your slave. Listen to what Sarah says, because through Isaac your descendants will carry on your name.
Hebrews 11:18
It was said: In Isaac your descendants will be called.

General references

Genesis 21:3
Abraham gave the name Isaac (he laughs) to the son Sarah bore him.
Genesis 25:5
Abraham left everything he owned to Isaac.