Genesis 17:12

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12 And every male among you who is ^aeight days old shall be circumcised throughout your generations, one who is born in the house or one who is bought with money from any foreigner, who is not of your seed.

Romans 4:11-13

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11 and he ^areceived the sign of circumcision, ^ba seal of the righteousness of the faith which ¹he had while uncircumcised, so that he might be ^cthe father of ^dall who believe without being circumcised, that righteousness might be counted to them, 12 and the father of circumcision to those who not only are of the circumcision, but who also follow in the steps of the faith of our father Abraham which ¹he had while uncircumcised.
13 For ^athe promise to Abraham or to his seed ^bthat he would be heir of the world was not ¹through the Law, but through the righteousness of faith.