Genesis 17:10-12
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10This is My covenant, which you shall keep, between Me and you and your descendants after you: every male among you shall be circumcised. 11And you shall be circumcised in the flesh of your foreskin, and it shall be the sign of the covenant between Me and you. 12And every male among you who is eight days old shall be circumcised throughout your generations, including a slave who is born in the house or who is bought with money from any foreigner, who is not of your descendants.