Exodus 12:48-49

48  a If a stranger shall sojourn with you and would keep the Passover to the  Lord, let all his males be circumcised. Then he may come near and keep it; he b shall be as a native of the land. But no uncircumcised person shall eat of it. 49 There shall be c one law for the native and for the d stranger who sojourns among you.”

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