But now circumcision is no longer required...
Ephesians 2:11-16 KJV
[11] Wherefore remember, that ye being in time past Gentiles in the flesh, who are called Uncircumcision by that which is called the Circumcision in the flesh made by hands; [12] That at that time ye were without Christ, being aliens from the commonwealth of Israel, and strangers from the covenants of promise, having no hope, and without God in the world: [13] But now in Christ Jesus ye who sometimes were far off are made nigh by the blood of Christ. [14] For he is our peace, who hath made both one, and hath broken down the middle wall of partition between us ; [15] Having abolished in his flesh the enmity, even the law of commandments contained in ordinances; for to make in himself of twain one new man, so making peace; [16] And that he might reconcile both unto God in one body by the cross, having slain the enmity thereby:
God made this clear, and Paul reiterated it.
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Deuteronomy 10:16 Circumcise therefore the foreskin of your
heart, and be no more stiffnecked.
Romans 2:29 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.
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Jeremiah 4:4 Circumcise yourselves to the LORD, and take away the foreskins of your
heart, ye men of Judah and inhabitants of Jerusalem: lest my fury come forth like fire, and burn that none can quench it, because of the evil of your doings.
Acts 7:49 Heaven is my throne, and earth is my footstool: what house will ye build me? saith the Lord: or what is the place of my rest?
Acts 7:50 Hath not my hand made all these things?
Acts 7:51 Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.
Notice how similar the words are the Stephen spoke in Acts 7, to the verse above in Deuteronomy?
That has always been the case.
God even told them that he gave them the land, NOT because of their goodness.
Deuteronomy 9:6 Understand therefore, that the LORD thy God giveth thee not this good land to possess it for thy righteousness; for thou art a stiffnecked people.
It has never been about people earning salvation through their own righteousness. It's always been about faith in God and seeking HIS ways which are always just, right and true.
There's so much more on this in the scriptures, as you know.