28 For he is not a Jew, who is one outwardly; nor is that circumcision, which is outward in the flesh.
Romans 2:28 Cross References - ABU
Matthew 3:9
9 and think not to say within yourselves, We have Abraham for our father; for I say to you, that God is able of these stones to raise up children to Abraham.
John 1:47
47 Jesus saw Nathanael coming to him, and says of him: Behold an Israelite indeed, in whom is no guile!
John 8:37-39
37 I know that ye are Abraham's seed; but ye seek to kill me, because my word has no place in you.
38 I speak what I have seen with my Father; and ye therefore do what ye have heard from your father.
39 They answered and said to him: Our father is Abraham. Jesus says to them: If ye were children of Abraham, ye would do the works of Abraham.
Romans 2:17
17 But if thou art called a Jew, and restest upon law, and makest thy boast in God,
Romans 4:10-12
10 How then was it reckoned? When he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision.
11 And he received the sign of circumcision, a seal of the righteousness of the faith which he had while in uncircumcision; that he might be father of all that believe while in uncircumcision, that the righteousness might be reckoned to them also,
12 and father of circumcision to those who are not only of the circumcision, but who also walk in the steps of the faith of our father Abraham, which he had while in uncircumcision.
Romans 9:6-8
6 Not as though the word of God has failed. For not all they are Israel, who are of Israel;
7 neither, because they are the seed of Abraham, are they all children; but, In Isaac shall thy seed be called.
8 That is, not they who are the children of the flesh are children of God; but the children of the promise are reckoned as seed.
Galatians 6:15
15 For in Christ Jesus neither circumcision avails anything, nor uncircumcision, but a new creation.
1 Peter 3:21
21 which in an antitype, immersion, now saves us also (not the putting away of the filth of the flesh, but the requirement of a good conscience toward God), by the resurrection of Jesus Christ;
Revelation 2:9
9 I know thy affliction, and poverty (but thou art rich), and the blasphemy of those who say they are Jews, and are not, but are the synagogue of Satan.