Exodus 12:48

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.

Numbers 9:14

14And if a stranger sojourns among you and would keep the Passover to the Lord, according to the statute of the Passover and according to its rule, so shall he do. cYou shall have one statute, both for the sojourner and for the native.”

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