Passover: Strangers Authorized to Celebrate
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Exodus 12:48, 49
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. / The same law shall apply to both the native and the foreigner who resides among you.”
Numbers 9:14
If a foreigner dwelling among you wants to observe the Passover to the LORD, he is to do so according to the Passover statute and its ordinances. You are to apply the same statute to both the foreigner and the native of the land.’”