Exodus 12:48-49

48 aIf 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 bshall be as a native of the land. But no uncircumcised person shall eat of it. 49There shall be cone law for the native and for the dstranger who sojourns among you.”

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