Romans 2:28

The true Jew is not one who is only so publicly, and circumcision is not that which may be seen in the flesh:

Galatians 6:15

For having circumcision is nothing, and not having circumcision is nothing, but only a new order of existence.

Matthew 3:9

And say not to yourselves, We have Abraham for our father; because I say to you that God is able from these stones to make children for Abraham.

Romans 9:6-8

But it is not as if the word of God was without effect. For they are not all Israel, who are of Israel:

Revelation 2:9

I have knowledge of your troubles and how poor you are (but you have true wealth), and the evil words of those who say they are Jews, and are not, but are a Synagogue of Satan.

Psalm 73:1

Truly, God is good to Israel, even to such as are clean in heart.

Isaiah 1:9-15

If the Lord of armies had not kept some at least of us safe, we would have been like Sodom, and the fate of Gomorrah would have been ours.

Isaiah 48:1-2

Give ear to this, O family of Jacob, you who are named by the name of Israel, and have come out of the body of Judah; who take oaths by the name of the Lord, and make use of the name of the God of Israel, but not truly and not in good faith.

Jeremiah 9:26

On Egypt and on Judah and on Edom and on the children of Ammon and on Moab and on all who have the ends of their hair cut, who are living in the waste land: for all these nations and all the people of Israel are without circumcision in their hearts.

Hosea 1:6-9

And after that she gave birth to a daughter. And the Lord said, Give her the name Lo-ruhamah; for I will not again have mercy on Israel, to give them forgiveness.

John 1:47

Jesus saw Nathanael coming to him and said of him, See, here is a true son of Israel in whom there is nothing false.

John 8:37-39

I am conscious that you are Abraham's seed; but you have a desire to put me to death because my word has no place in you.

Romans 2:17

But as for you who have the name of Jew, and are resting on the law, and take pride in God,

Romans 4:10-12

How, then, was it judged? when he had circumcision, or when he had it not? Not when he had it, but when he did not have it:

1 Peter 3:21

And baptism, of which this is an image, now gives you salvation, not by washing clean the flesh, but by making you free from the sense of sin before God, through the coming again of Jesus Christ from the dead;

Treasury of Scripture Knowledge

Summary

For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:

Bible References

For he

Romans 9:6
But it is not as if the word of God was without effect. For they are not all Israel, who are of Israel:
Psalm 73:1
Truly, God is good to Israel, even to such as are clean in heart.
Isaiah 1:9
If the Lord of armies had not kept some at least of us safe, we would have been like Sodom, and the fate of Gomorrah would have been ours.
Isaiah 48:1
Give ear to this, O family of Jacob, you who are named by the name of Israel, and have come out of the body of Judah; who take oaths by the name of the Lord, and make use of the name of the God of Israel, but not truly and not in good faith.
Hosea 1:6
And after that she gave birth to a daughter. And the Lord said, Give her the name Lo-ruhamah; for I will not again have mercy on Israel, to give them forgiveness.
Matthew 3:9
And say not to yourselves, We have Abraham for our father; because I say to you that God is able from these stones to make children for Abraham.
John 1:47
Jesus saw Nathanael coming to him and said of him, See, here is a true son of Israel in whom there is nothing false.
John 8:37
I am conscious that you are Abraham's seed; but you have a desire to put me to death because my word has no place in you.
Galatians 6:15
For having circumcision is nothing, and not having circumcision is nothing, but only a new order of existence.
Revelation 2:9
I have knowledge of your troubles and how poor you are (but you have true wealth), and the evil words of those who say they are Jews, and are not, but are a Synagogue of Satan.

Neither

Jeremiah 9:26
On Egypt and on Judah and on Edom and on the children of Ammon and on Moab and on all who have the ends of their hair cut, who are living in the waste land: for all these nations and all the people of Israel are without circumcision in their hearts.
Romans 4:10
How, then, was it judged? when he had circumcision, or when he had it not? Not when he had it, but when he did not have it:
1 Peter 3:21
And baptism, of which this is an image, now gives you salvation, not by washing clean the flesh, but by making you free from the sense of sin before God, through the coming again of Jesus Christ from the dead;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain