Strangers: Mosaic Law Relating to Their Eating the Passover Meal
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Exodus 12:43, 48
And the LORD said to Moses and Aaron, “This is the statute of the Passover: No foreigner is to eat of it. / If a foreigner resides with you and wants to celebrate the LORD’s Passover, all the males in the household must be circumcised; then he may come near to celebrate it, and he shall be like a native of the land. But no uncircumcised man may eat of it.