And if a stranger... — The law respecting the stranger is contained in Exodus 12:48-49.
Related Commentaries of Numbers 9:14
Numbers 9:14
14 And if a stranger shall sojourn among you, and will keep the passover unto the LORD; according to the ordinance of the passover, and according to the manner thereof, so shall he do: ye shall have one ordinance, both for the stranger, and for him that was born in the land.