Romans 9:7

neither are the children all the seed of Abraham; but in Isaac shall thy seed be called;

Hebrews 11:18

in reference to whom it was said, In Isaac shall thy seed be called:

Luke 3:8

Bring forth therefore fruits worthy of repentance, and do not begin to say among yourselves; We have Abraham our father.

Luke 16:24-25

And he calling said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue, because I am tormented in this flame.

Luke 16:30

But he said, No, father Abraham: but if one may go to them from the dead, they will repent.

John 8:33

They responded to Him, we are the seed of Abraham, and have never been in bondage to any one: How do You say, that you shall be free?

John 8:37-39

I know ye are the seed of Abraham; but you seek to kill me, because my word has no place in you.

Philippians 3:3

For we are the circumcision, who serve the Spirit of God, and boast in Christ Jesus, also having 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.

In isaac

Bible References

Because

Luke 3:8
Bring forth therefore fruits worthy of repentance, and do not begin to say among yourselves; We have Abraham our father.
Luke 16:24
And he calling said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue, because I am tormented in this flame.
John 8:37
I know ye are the seed of Abraham; but you seek to kill me, because my word has no place in you.
Philippians 3:3
For we are the circumcision, who serve the Spirit of God, and boast in Christ Jesus, also having no confidence in the flesh:

In isaac

Hebrews 11:18
in reference to whom it was said, In Isaac shall thy seed be called: