Philippians 3:3

For we are the true circumcision, who by the Spirit of God worship Him, who take pride in Christ Jesus only, and do not rely on outward privileges,

Colossians 2:11

And through your union with Him you once received, not a hand-performed circumcision but one performed by Christ, in stripping you of your lower nature,

Jude 1:20

But you, dearly beloved, must continue to build yourselves up on the groundwork of your most holy faith and to pray in the Holy Spirit;

John 4:23-24

But a time is coming -- indeed, it is already here -- when the real worshipers will worship the Father in spirit and reality, for the Father is looking for just such worshipers.

Romans 1:9

Indeed, my witness is God, whom I serve in my spirit by telling the good news about His Son, that I never fail to mention you every time I pray,

Romans 2:25-29

Now circumcision benefits you only if you practice the law, but if you break the law, your circumcision is no better than uncircumcision.

Romans 4:11-12

Afterward he received the mark of circumcision as God's seal of his right standing with Him on condition of faith which he had before he was circumcised, that he might be the forefather of all who have faith while still uncircumcised, that they might have their faith credited to them as right standing with God;

Romans 7:6

But now we have been freed from our relation to the law; we have ended our relation to that by which we once were held in bonds, so that we may serve in a new spiritual way and not in the old literalistic way.

Romans 8:15

For you do not have a sense of servitude to fill you with dread again, but the consciousness of adopted sons by which we cry, "Abba," that is, "Father."

Romans 8:26-27

In the same way the Spirit, too, is helping us in our weakness, for we do not know how to pray as we should, but the Spirit Himself pleads for us with unspeakable yearnings,

Romans 15:17

So, as a Christian, I am proud of the things that I have done for God.

1 Corinthians 1:29-31

so that no mortal man might ever boast in the presence of God.

Galatians 5:25

If we live by the Spirit, let us also walk where the Spirit leads.

Galatians 6:13-15

Indeed, the very men who let themselves be circumcised do not themselves observe the law. But they simply want you to let yourselves be circumcised, so that they can boast of you as members of their party.

Ephesians 6:18

Keep on praying in the Spirit, with every kind of prayer and entreaty, at every opportunity, be ever on the alert with perfect devotion and entreaty for all God's people,

Philippians 3:4-9

though I too might rely on these. If anyone thinks that he can rely on outward privileges, far more might I do so:

1 Peter 1:23-25

because you have been born anew, not from a germ that perishes but from one that does not perish, by the word of the living and everlasting God.

Treasury of Scripture Knowledge

Summary

For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh.

Bible References

We

Romans 2:25
Now circumcision benefits you only if you practice the law, but if you break the law, your circumcision is no better than uncircumcision.
Romans 4:11
Afterward he received the mark of circumcision as God's seal of his right standing with Him on condition of faith which he had before he was circumcised, that he might be the forefather of all who have faith while still uncircumcised, that they might have their faith credited to them as right standing with God;
Colossians 2:11
And through your union with Him you once received, not a hand-performed circumcision but one performed by Christ, in stripping you of your lower nature,

Have

Philippians 3:4
though I too might rely on these. If anyone thinks that he can rely on outward privileges, far more might I do so:
1 Peter 1:23
because you have been born anew, not from a germ that perishes but from one that does not perish, by the word of the living and everlasting God.

General references

Luke 1:46
Then Mary said: "My soul extols the Lord;
Romans 2:26
So if the uncircumcised heathen man observes the just demands of the law, will he not be counted as though he were a Jew?
Romans 3:30
since there is but one God, who will consider the Jews in right standing with Himself, only on condition of their faith, and the heathen peoples on the same condition.
1 Corinthians 1:31
so that, as the Scripture says, "Let him who boasts boast in the Lord."
2 Corinthians 10:17
"But the man who boasts must boast in the Lord.
Philippians 1:26
which will result in your joy; so that, through union with Christ Jesus, you may have more than sufficient ground for boasting about me, through my being with you again.