Born in the land - A stranger or foreigner might be born in the land, but the word here used means “a native of the land,” belonging to the country by virtue of descent, that descent being reckoned from Abraham, to whom Canaan was promised as a perpetual inheritance.
Related Commentaries of Exodus 12:19
Exodus 12:19
19 Seven days shall there be no leaven found in your houses: for whosoever eateth that which is leavened, even that soul shall be cut off from the congregation of Israel, whether he be a stranger, or born in the land.