Romans 2:28
"For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:"
Cross References (ranked by relevance)
For in Christ Jesus neither circumcision availeth any thing, nor uncircumcision, but a new creature.
And think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham.
I know thy works, and tribulation, and poverty, (but thou art rich) and I know the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan.
The like figure whereunto even baptism doth also now save us (not the putting away of the filth of the flesh, but the answer of a good conscience toward God,) by the resurrection of Jesus Christ:
Jesus saw Nathanael coming to him, and saith of him, Behold an Israelite indeed, in whom is no guile!
Truly God is good to Israel, even to such as are of a clean heart.
Egypt, and Judah, and Edom, and the children of Ammon, and Moab, and all that are in the utmost corners, that dwell in the wilderness: for all these nations are uncircumcised, and all the house of Israel are uncircumcised in the heart.
Behold, thou art called a Jew, and restest in the law, and makest thy boast of God,