Bible Verses About The New Birth: Circumcision of the heart
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For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.
For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh.
And that ye put on the new man, which after God is created in righteousness and true holiness.
Verses on Circumcision of the heart
And the LORD thy God will circumcise thine heart, and the heart of thy seed, to love the LORD thy God with all thine heart, and with all thy soul, that thou mayest live.
But he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God.
In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ: