Exodus 12:48,49
And when a stranger shall sojourn with you, and will keep the passover to the LORD, let all his males be circumcised, and then let him come near and keep it; and he shall be as one that is born in the land: for no uncircumcised person shall eat thereof.
Nave's Topical Index—AKJV

Numbers 9:14
And if a stranger shall sojourn among you, and will keep the passover to the LORD; according to the ordinance of the passover, and according to the manner thereof, so shall he do: you shall have one ordinance, both for the stranger, and for him that was born in the land.
Nave's Topical Index—AKJV